]>
Commit | Line | Data |
---|---|---|
bcb02034 SF |
1 | /* |
2 | * fs/cifs/cifsacl.c | |
3 | * | |
8b1327f6 | 4 | * Copyright (C) International Business Machines Corp., 2007,2008 |
bcb02034 SF |
5 | * Author(s): Steve French (sfrench@us.ibm.com) |
6 | * | |
7 | * Contains the routines for mapping CIFS/NTFS ACLs | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU Lesser General Public License as published | |
11 | * by the Free Software Foundation; either version 2.1 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This library 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 | |
17 | * the GNU Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public License | |
20 | * along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
65874007 | 24 | #include <linux/fs.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
4d79dba0 SP |
26 | #include <linux/string.h> |
27 | #include <linux/keyctl.h> | |
28 | #include <linux/key-type.h> | |
29 | #include <keys/user-type.h> | |
65874007 SF |
30 | #include "cifspdu.h" |
31 | #include "cifsglob.h" | |
d0d66c44 | 32 | #include "cifsacl.h" |
65874007 SF |
33 | #include "cifsproto.h" |
34 | #include "cifs_debug.h" | |
65874007 | 35 | |
2fbc2f17 | 36 | /* security id for everyone/world system group */ |
e01b6400 SP |
37 | static const struct cifs_sid sid_everyone = { |
38 | 1, 1, {0, 0, 0, 0, 0, 1}, {0} }; | |
2fbc2f17 SP |
39 | /* security id for Authenticated Users system group */ |
40 | static const struct cifs_sid sid_authusers = { | |
4f61258f | 41 | 1, 1, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(11)} }; |
bcb02034 | 42 | /* group users */ |
ad7a2926 | 43 | static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} }; |
d0d66c44 | 44 | |
9409ae58 SP |
45 | const struct cred *root_cred; |
46 | ||
47 | static void | |
48 | shrink_idmap_tree(struct rb_root *root, int nr_to_scan, int *nr_rem, | |
49 | int *nr_del) | |
50 | { | |
51 | struct rb_node *node; | |
52 | struct rb_node *tmp; | |
53 | struct cifs_sid_id *psidid; | |
54 | ||
55 | node = rb_first(root); | |
56 | while (node) { | |
57 | tmp = node; | |
58 | node = rb_next(tmp); | |
59 | psidid = rb_entry(tmp, struct cifs_sid_id, rbnode); | |
60 | if (nr_to_scan == 0 || *nr_del == nr_to_scan) | |
61 | ++(*nr_rem); | |
62 | else { | |
63 | if (time_after(jiffies, psidid->time + SID_MAP_EXPIRE) | |
64 | && psidid->refcount == 0) { | |
65 | rb_erase(tmp, root); | |
66 | ++(*nr_del); | |
67 | } else | |
68 | ++(*nr_rem); | |
69 | } | |
70 | } | |
71 | } | |
4d79dba0 SP |
72 | |
73 | /* | |
74 | * Run idmap cache shrinker. | |
75 | */ | |
76 | static int | |
ef1d5759 | 77 | cifs_idmap_shrinker(struct shrinker *shrink, struct shrink_control *sc) |
4d79dba0 | 78 | { |
ef1d5759 | 79 | int nr_to_scan = sc->nr_to_scan; |
9409ae58 SP |
80 | int nr_del = 0; |
81 | int nr_rem = 0; | |
82 | struct rb_root *root; | |
83 | ||
84 | root = &uidtree; | |
85 | spin_lock(&siduidlock); | |
86 | shrink_idmap_tree(root, nr_to_scan, &nr_rem, &nr_del); | |
87 | spin_unlock(&siduidlock); | |
88 | ||
89 | root = &gidtree; | |
90 | spin_lock(&sidgidlock); | |
91 | shrink_idmap_tree(root, nr_to_scan, &nr_rem, &nr_del); | |
92 | spin_unlock(&sidgidlock); | |
93 | ||
21fed0d5 SP |
94 | root = &siduidtree; |
95 | spin_lock(&uidsidlock); | |
96 | shrink_idmap_tree(root, nr_to_scan, &nr_rem, &nr_del); | |
97 | spin_unlock(&uidsidlock); | |
98 | ||
99 | root = &sidgidtree; | |
100 | spin_lock(&gidsidlock); | |
101 | shrink_idmap_tree(root, nr_to_scan, &nr_rem, &nr_del); | |
102 | spin_unlock(&gidsidlock); | |
103 | ||
9409ae58 | 104 | return nr_rem; |
4d79dba0 SP |
105 | } |
106 | ||
21fed0d5 SP |
107 | static void |
108 | sid_rb_insert(struct rb_root *root, unsigned long cid, | |
109 | struct cifs_sid_id **psidid, char *typestr) | |
110 | { | |
111 | char *strptr; | |
112 | struct rb_node *node = root->rb_node; | |
113 | struct rb_node *parent = NULL; | |
114 | struct rb_node **linkto = &(root->rb_node); | |
115 | struct cifs_sid_id *lsidid; | |
116 | ||
117 | while (node) { | |
118 | lsidid = rb_entry(node, struct cifs_sid_id, rbnode); | |
119 | parent = node; | |
120 | if (cid > lsidid->id) { | |
121 | linkto = &(node->rb_left); | |
122 | node = node->rb_left; | |
123 | } | |
124 | if (cid < lsidid->id) { | |
125 | linkto = &(node->rb_right); | |
126 | node = node->rb_right; | |
127 | } | |
128 | } | |
129 | ||
130 | (*psidid)->id = cid; | |
131 | (*psidid)->time = jiffies - (SID_MAP_RETRY + 1); | |
132 | (*psidid)->refcount = 0; | |
133 | ||
134 | sprintf((*psidid)->sidstr, "%s", typestr); | |
135 | strptr = (*psidid)->sidstr + strlen((*psidid)->sidstr); | |
136 | sprintf(strptr, "%ld", cid); | |
137 | ||
138 | clear_bit(SID_ID_PENDING, &(*psidid)->state); | |
139 | clear_bit(SID_ID_MAPPED, &(*psidid)->state); | |
140 | ||
141 | rb_link_node(&(*psidid)->rbnode, parent, linkto); | |
142 | rb_insert_color(&(*psidid)->rbnode, root); | |
143 | } | |
144 | ||
145 | static struct cifs_sid_id * | |
146 | sid_rb_search(struct rb_root *root, unsigned long cid) | |
147 | { | |
148 | struct rb_node *node = root->rb_node; | |
149 | struct cifs_sid_id *lsidid; | |
150 | ||
151 | while (node) { | |
152 | lsidid = rb_entry(node, struct cifs_sid_id, rbnode); | |
153 | if (cid > lsidid->id) | |
154 | node = node->rb_left; | |
155 | else if (cid < lsidid->id) | |
156 | node = node->rb_right; | |
157 | else /* node found */ | |
158 | return lsidid; | |
159 | } | |
160 | ||
161 | return NULL; | |
162 | } | |
163 | ||
4d79dba0 SP |
164 | static struct shrinker cifs_shrinker = { |
165 | .shrink = cifs_idmap_shrinker, | |
166 | .seeks = DEFAULT_SEEKS, | |
167 | }; | |
168 | ||
169 | static int | |
cf7f601c | 170 | cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep) |
4d79dba0 SP |
171 | { |
172 | char *payload; | |
173 | ||
cf7f601c | 174 | payload = kmalloc(prep->datalen, GFP_KERNEL); |
4d79dba0 SP |
175 | if (!payload) |
176 | return -ENOMEM; | |
177 | ||
cf7f601c | 178 | memcpy(payload, prep->data, prep->datalen); |
4d79dba0 | 179 | key->payload.data = payload; |
cf7f601c | 180 | key->datalen = prep->datalen; |
4d79dba0 SP |
181 | return 0; |
182 | } | |
183 | ||
184 | static inline void | |
185 | cifs_idmap_key_destroy(struct key *key) | |
186 | { | |
187 | kfree(key->payload.data); | |
188 | } | |
189 | ||
4d79dba0 | 190 | struct key_type cifs_idmap_key_type = { |
c4aca0c0 | 191 | .name = "cifs.idmap", |
4d79dba0 SP |
192 | .instantiate = cifs_idmap_key_instantiate, |
193 | .destroy = cifs_idmap_key_destroy, | |
194 | .describe = user_describe, | |
195 | .match = user_match, | |
196 | }; | |
197 | ||
9409ae58 SP |
198 | static void |
199 | sid_to_str(struct cifs_sid *sidptr, char *sidstr) | |
200 | { | |
201 | int i; | |
202 | unsigned long saval; | |
203 | char *strptr; | |
204 | ||
205 | strptr = sidstr; | |
206 | ||
207 | sprintf(strptr, "%s", "S"); | |
208 | strptr = sidstr + strlen(sidstr); | |
209 | ||
210 | sprintf(strptr, "-%d", sidptr->revision); | |
211 | strptr = sidstr + strlen(sidstr); | |
212 | ||
213 | for (i = 0; i < 6; ++i) { | |
214 | if (sidptr->authority[i]) { | |
215 | sprintf(strptr, "-%d", sidptr->authority[i]); | |
216 | strptr = sidstr + strlen(sidstr); | |
217 | } | |
218 | } | |
219 | ||
220 | for (i = 0; i < sidptr->num_subauth; ++i) { | |
221 | saval = le32_to_cpu(sidptr->sub_auth[i]); | |
222 | sprintf(strptr, "-%ld", saval); | |
223 | strptr = sidstr + strlen(sidstr); | |
224 | } | |
225 | } | |
226 | ||
36960e44 JL |
227 | static void |
228 | cifs_copy_sid(struct cifs_sid *dst, const struct cifs_sid *src) | |
229 | { | |
230 | memcpy(dst, src, sizeof(*dst)); | |
231 | dst->num_subauth = min_t(u8, src->num_subauth, NUM_SUBAUTHS); | |
232 | } | |
233 | ||
9409ae58 SP |
234 | static void |
235 | id_rb_insert(struct rb_root *root, struct cifs_sid *sidptr, | |
236 | struct cifs_sid_id **psidid, char *typestr) | |
237 | { | |
238 | int rc; | |
239 | char *strptr; | |
240 | struct rb_node *node = root->rb_node; | |
241 | struct rb_node *parent = NULL; | |
242 | struct rb_node **linkto = &(root->rb_node); | |
243 | struct cifs_sid_id *lsidid; | |
244 | ||
245 | while (node) { | |
246 | lsidid = rb_entry(node, struct cifs_sid_id, rbnode); | |
247 | parent = node; | |
248 | rc = compare_sids(sidptr, &((lsidid)->sid)); | |
249 | if (rc > 0) { | |
250 | linkto = &(node->rb_left); | |
251 | node = node->rb_left; | |
252 | } else if (rc < 0) { | |
253 | linkto = &(node->rb_right); | |
254 | node = node->rb_right; | |
255 | } | |
256 | } | |
257 | ||
36960e44 | 258 | cifs_copy_sid(&(*psidid)->sid, sidptr); |
9409ae58 SP |
259 | (*psidid)->time = jiffies - (SID_MAP_RETRY + 1); |
260 | (*psidid)->refcount = 0; | |
261 | ||
262 | sprintf((*psidid)->sidstr, "%s", typestr); | |
263 | strptr = (*psidid)->sidstr + strlen((*psidid)->sidstr); | |
264 | sid_to_str(&(*psidid)->sid, strptr); | |
265 | ||
266 | clear_bit(SID_ID_PENDING, &(*psidid)->state); | |
267 | clear_bit(SID_ID_MAPPED, &(*psidid)->state); | |
268 | ||
269 | rb_link_node(&(*psidid)->rbnode, parent, linkto); | |
270 | rb_insert_color(&(*psidid)->rbnode, root); | |
271 | } | |
272 | ||
273 | static struct cifs_sid_id * | |
274 | id_rb_search(struct rb_root *root, struct cifs_sid *sidptr) | |
275 | { | |
276 | int rc; | |
277 | struct rb_node *node = root->rb_node; | |
9409ae58 SP |
278 | struct cifs_sid_id *lsidid; |
279 | ||
280 | while (node) { | |
281 | lsidid = rb_entry(node, struct cifs_sid_id, rbnode); | |
9409ae58 SP |
282 | rc = compare_sids(sidptr, &((lsidid)->sid)); |
283 | if (rc > 0) { | |
9409ae58 SP |
284 | node = node->rb_left; |
285 | } else if (rc < 0) { | |
9409ae58 SP |
286 | node = node->rb_right; |
287 | } else /* node found */ | |
288 | return lsidid; | |
289 | } | |
290 | ||
291 | return NULL; | |
292 | } | |
293 | ||
294 | static int | |
295 | sidid_pending_wait(void *unused) | |
296 | { | |
297 | schedule(); | |
298 | return signal_pending(current) ? -ERESTARTSYS : 0; | |
299 | } | |
300 | ||
21fed0d5 SP |
301 | static int |
302 | id_to_sid(unsigned long cid, uint sidtype, struct cifs_sid *ssid) | |
303 | { | |
304 | int rc = 0; | |
305 | struct key *sidkey; | |
306 | const struct cred *saved_cred; | |
307 | struct cifs_sid *lsid; | |
308 | struct cifs_sid_id *psidid, *npsidid; | |
309 | struct rb_root *cidtree; | |
310 | spinlock_t *cidlock; | |
311 | ||
312 | if (sidtype == SIDOWNER) { | |
313 | cidlock = &siduidlock; | |
314 | cidtree = &uidtree; | |
315 | } else if (sidtype == SIDGROUP) { | |
316 | cidlock = &sidgidlock; | |
317 | cidtree = &gidtree; | |
318 | } else | |
319 | return -EINVAL; | |
320 | ||
321 | spin_lock(cidlock); | |
322 | psidid = sid_rb_search(cidtree, cid); | |
323 | ||
324 | if (!psidid) { /* node does not exist, allocate one & attempt adding */ | |
325 | spin_unlock(cidlock); | |
326 | npsidid = kzalloc(sizeof(struct cifs_sid_id), GFP_KERNEL); | |
327 | if (!npsidid) | |
328 | return -ENOMEM; | |
329 | ||
330 | npsidid->sidstr = kmalloc(SIDLEN, GFP_KERNEL); | |
331 | if (!npsidid->sidstr) { | |
332 | kfree(npsidid); | |
333 | return -ENOMEM; | |
334 | } | |
335 | ||
336 | spin_lock(cidlock); | |
337 | psidid = sid_rb_search(cidtree, cid); | |
338 | if (psidid) { /* node happened to get inserted meanwhile */ | |
339 | ++psidid->refcount; | |
340 | spin_unlock(cidlock); | |
341 | kfree(npsidid->sidstr); | |
342 | kfree(npsidid); | |
343 | } else { | |
344 | psidid = npsidid; | |
345 | sid_rb_insert(cidtree, cid, &psidid, | |
346 | sidtype == SIDOWNER ? "oi:" : "gi:"); | |
347 | ++psidid->refcount; | |
348 | spin_unlock(cidlock); | |
349 | } | |
350 | } else { | |
351 | ++psidid->refcount; | |
352 | spin_unlock(cidlock); | |
353 | } | |
354 | ||
355 | /* | |
356 | * If we are here, it is safe to access psidid and its fields | |
357 | * since a reference was taken earlier while holding the spinlock. | |
358 | * A reference on the node is put without holding the spinlock | |
359 | * and it is OK to do so in this case, shrinker will not erase | |
360 | * this node until all references are put and we do not access | |
361 | * any fields of the node after a reference is put . | |
362 | */ | |
363 | if (test_bit(SID_ID_MAPPED, &psidid->state)) { | |
36960e44 | 364 | cifs_copy_sid(ssid, &psidid->sid); |
21fed0d5 SP |
365 | psidid->time = jiffies; /* update ts for accessing */ |
366 | goto id_sid_out; | |
367 | } | |
368 | ||
369 | if (time_after(psidid->time + SID_MAP_RETRY, jiffies)) { | |
370 | rc = -EINVAL; | |
371 | goto id_sid_out; | |
372 | } | |
373 | ||
374 | if (!test_and_set_bit(SID_ID_PENDING, &psidid->state)) { | |
375 | saved_cred = override_creds(root_cred); | |
376 | sidkey = request_key(&cifs_idmap_key_type, psidid->sidstr, ""); | |
377 | if (IS_ERR(sidkey)) { | |
378 | rc = -EINVAL; | |
379 | cFYI(1, "%s: Can't map and id to a SID", __func__); | |
36960e44 JL |
380 | } else if (sidkey->datalen < sizeof(struct cifs_sid)) { |
381 | rc = -EIO; | |
382 | cFYI(1, "%s: Downcall contained malformed key " | |
383 | "(datalen=%hu)", __func__, sidkey->datalen); | |
21fed0d5 SP |
384 | } else { |
385 | lsid = (struct cifs_sid *)sidkey->payload.data; | |
36960e44 JL |
386 | cifs_copy_sid(&psidid->sid, lsid); |
387 | cifs_copy_sid(ssid, &psidid->sid); | |
21fed0d5 SP |
388 | set_bit(SID_ID_MAPPED, &psidid->state); |
389 | key_put(sidkey); | |
390 | kfree(psidid->sidstr); | |
391 | } | |
392 | psidid->time = jiffies; /* update ts for accessing */ | |
393 | revert_creds(saved_cred); | |
394 | clear_bit(SID_ID_PENDING, &psidid->state); | |
395 | wake_up_bit(&psidid->state, SID_ID_PENDING); | |
396 | } else { | |
397 | rc = wait_on_bit(&psidid->state, SID_ID_PENDING, | |
398 | sidid_pending_wait, TASK_INTERRUPTIBLE); | |
399 | if (rc) { | |
400 | cFYI(1, "%s: sidid_pending_wait interrupted %d", | |
401 | __func__, rc); | |
402 | --psidid->refcount; | |
403 | return rc; | |
404 | } | |
405 | if (test_bit(SID_ID_MAPPED, &psidid->state)) | |
36960e44 | 406 | cifs_copy_sid(ssid, &psidid->sid); |
21fed0d5 SP |
407 | else |
408 | rc = -EINVAL; | |
409 | } | |
410 | id_sid_out: | |
411 | --psidid->refcount; | |
412 | return rc; | |
413 | } | |
414 | ||
9409ae58 SP |
415 | static int |
416 | sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid, | |
417 | struct cifs_fattr *fattr, uint sidtype) | |
418 | { | |
419 | int rc; | |
420 | unsigned long cid; | |
421 | struct key *idkey; | |
422 | const struct cred *saved_cred; | |
423 | struct cifs_sid_id *psidid, *npsidid; | |
424 | struct rb_root *cidtree; | |
425 | spinlock_t *cidlock; | |
426 | ||
427 | if (sidtype == SIDOWNER) { | |
428 | cid = cifs_sb->mnt_uid; /* default uid, in case upcall fails */ | |
429 | cidlock = &siduidlock; | |
430 | cidtree = &uidtree; | |
431 | } else if (sidtype == SIDGROUP) { | |
432 | cid = cifs_sb->mnt_gid; /* default gid, in case upcall fails */ | |
433 | cidlock = &sidgidlock; | |
434 | cidtree = &gidtree; | |
435 | } else | |
436 | return -ENOENT; | |
437 | ||
438 | spin_lock(cidlock); | |
439 | psidid = id_rb_search(cidtree, psid); | |
440 | ||
441 | if (!psidid) { /* node does not exist, allocate one & attempt adding */ | |
442 | spin_unlock(cidlock); | |
443 | npsidid = kzalloc(sizeof(struct cifs_sid_id), GFP_KERNEL); | |
444 | if (!npsidid) | |
445 | return -ENOMEM; | |
446 | ||
447 | npsidid->sidstr = kmalloc(SIDLEN, GFP_KERNEL); | |
448 | if (!npsidid->sidstr) { | |
449 | kfree(npsidid); | |
450 | return -ENOMEM; | |
451 | } | |
452 | ||
453 | spin_lock(cidlock); | |
454 | psidid = id_rb_search(cidtree, psid); | |
455 | if (psidid) { /* node happened to get inserted meanwhile */ | |
456 | ++psidid->refcount; | |
457 | spin_unlock(cidlock); | |
458 | kfree(npsidid->sidstr); | |
459 | kfree(npsidid); | |
460 | } else { | |
461 | psidid = npsidid; | |
462 | id_rb_insert(cidtree, psid, &psidid, | |
463 | sidtype == SIDOWNER ? "os:" : "gs:"); | |
464 | ++psidid->refcount; | |
465 | spin_unlock(cidlock); | |
466 | } | |
467 | } else { | |
468 | ++psidid->refcount; | |
469 | spin_unlock(cidlock); | |
470 | } | |
471 | ||
472 | /* | |
473 | * If we are here, it is safe to access psidid and its fields | |
474 | * since a reference was taken earlier while holding the spinlock. | |
475 | * A reference on the node is put without holding the spinlock | |
476 | * and it is OK to do so in this case, shrinker will not erase | |
477 | * this node until all references are put and we do not access | |
478 | * any fields of the node after a reference is put . | |
479 | */ | |
480 | if (test_bit(SID_ID_MAPPED, &psidid->state)) { | |
481 | cid = psidid->id; | |
482 | psidid->time = jiffies; /* update ts for accessing */ | |
483 | goto sid_to_id_out; | |
484 | } | |
485 | ||
486 | if (time_after(psidid->time + SID_MAP_RETRY, jiffies)) | |
487 | goto sid_to_id_out; | |
488 | ||
489 | if (!test_and_set_bit(SID_ID_PENDING, &psidid->state)) { | |
490 | saved_cred = override_creds(root_cred); | |
491 | idkey = request_key(&cifs_idmap_key_type, psidid->sidstr, ""); | |
492 | if (IS_ERR(idkey)) | |
493 | cFYI(1, "%s: Can't map SID to an id", __func__); | |
494 | else { | |
495 | cid = *(unsigned long *)idkey->payload.value; | |
496 | psidid->id = cid; | |
497 | set_bit(SID_ID_MAPPED, &psidid->state); | |
498 | key_put(idkey); | |
499 | kfree(psidid->sidstr); | |
500 | } | |
501 | revert_creds(saved_cred); | |
502 | psidid->time = jiffies; /* update ts for accessing */ | |
503 | clear_bit(SID_ID_PENDING, &psidid->state); | |
504 | wake_up_bit(&psidid->state, SID_ID_PENDING); | |
505 | } else { | |
506 | rc = wait_on_bit(&psidid->state, SID_ID_PENDING, | |
507 | sidid_pending_wait, TASK_INTERRUPTIBLE); | |
508 | if (rc) { | |
509 | cFYI(1, "%s: sidid_pending_wait interrupted %d", | |
510 | __func__, rc); | |
511 | --psidid->refcount; /* decremented without spinlock */ | |
512 | return rc; | |
513 | } | |
514 | if (test_bit(SID_ID_MAPPED, &psidid->state)) | |
515 | cid = psidid->id; | |
516 | } | |
517 | ||
518 | sid_to_id_out: | |
519 | --psidid->refcount; /* decremented without spinlock */ | |
520 | if (sidtype == SIDOWNER) | |
521 | fattr->cf_uid = cid; | |
522 | else | |
523 | fattr->cf_gid = cid; | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
4d79dba0 SP |
528 | int |
529 | init_cifs_idmap(void) | |
530 | { | |
531 | struct cred *cred; | |
532 | struct key *keyring; | |
533 | int ret; | |
534 | ||
ac3aa2f8 | 535 | cFYI(1, "Registering the %s key type", cifs_idmap_key_type.name); |
4d79dba0 SP |
536 | |
537 | /* create an override credential set with a special thread keyring in | |
538 | * which requests are cached | |
539 | * | |
540 | * this is used to prevent malicious redirections from being installed | |
541 | * with add_key(). | |
542 | */ | |
543 | cred = prepare_kernel_cred(NULL); | |
544 | if (!cred) | |
545 | return -ENOMEM; | |
546 | ||
547 | keyring = key_alloc(&key_type_keyring, ".cifs_idmap", 0, 0, cred, | |
548 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
549 | KEY_USR_VIEW | KEY_USR_READ, | |
550 | KEY_ALLOC_NOT_IN_QUOTA); | |
551 | if (IS_ERR(keyring)) { | |
552 | ret = PTR_ERR(keyring); | |
553 | goto failed_put_cred; | |
554 | } | |
555 | ||
556 | ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL); | |
557 | if (ret < 0) | |
558 | goto failed_put_key; | |
559 | ||
560 | ret = register_key_type(&cifs_idmap_key_type); | |
561 | if (ret < 0) | |
562 | goto failed_put_key; | |
563 | ||
564 | /* instruct request_key() to use this special keyring as a cache for | |
565 | * the results it looks up */ | |
700920eb | 566 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
4d79dba0 SP |
567 | cred->thread_keyring = keyring; |
568 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
569 | root_cred = cred; | |
570 | ||
571 | spin_lock_init(&siduidlock); | |
572 | uidtree = RB_ROOT; | |
573 | spin_lock_init(&sidgidlock); | |
574 | gidtree = RB_ROOT; | |
575 | ||
21fed0d5 SP |
576 | spin_lock_init(&uidsidlock); |
577 | siduidtree = RB_ROOT; | |
578 | spin_lock_init(&gidsidlock); | |
579 | sidgidtree = RB_ROOT; | |
4d79dba0 SP |
580 | register_shrinker(&cifs_shrinker); |
581 | ||
ac3aa2f8 | 582 | cFYI(1, "cifs idmap keyring: %d", key_serial(keyring)); |
4d79dba0 SP |
583 | return 0; |
584 | ||
585 | failed_put_key: | |
586 | key_put(keyring); | |
587 | failed_put_cred: | |
588 | put_cred(cred); | |
589 | return ret; | |
590 | } | |
591 | ||
592 | void | |
593 | exit_cifs_idmap(void) | |
594 | { | |
595 | key_revoke(root_cred->thread_keyring); | |
596 | unregister_key_type(&cifs_idmap_key_type); | |
597 | put_cred(root_cred); | |
598 | unregister_shrinker(&cifs_shrinker); | |
ac3aa2f8 | 599 | cFYI(1, "Unregistered %s key type", cifs_idmap_key_type.name); |
4d79dba0 SP |
600 | } |
601 | ||
602 | void | |
603 | cifs_destroy_idmaptrees(void) | |
604 | { | |
605 | struct rb_root *root; | |
606 | struct rb_node *node; | |
607 | ||
608 | root = &uidtree; | |
609 | spin_lock(&siduidlock); | |
610 | while ((node = rb_first(root))) | |
611 | rb_erase(node, root); | |
612 | spin_unlock(&siduidlock); | |
613 | ||
614 | root = &gidtree; | |
615 | spin_lock(&sidgidlock); | |
616 | while ((node = rb_first(root))) | |
617 | rb_erase(node, root); | |
618 | spin_unlock(&sidgidlock); | |
21fed0d5 SP |
619 | |
620 | root = &siduidtree; | |
621 | spin_lock(&uidsidlock); | |
622 | while ((node = rb_first(root))) | |
623 | rb_erase(node, root); | |
624 | spin_unlock(&uidsidlock); | |
625 | ||
626 | root = &sidgidtree; | |
627 | spin_lock(&gidsidlock); | |
628 | while ((node = rb_first(root))) | |
629 | rb_erase(node, root); | |
630 | spin_unlock(&gidsidlock); | |
4d79dba0 | 631 | } |
297647c2 | 632 | |
a750e77c SF |
633 | /* if the two SIDs (roughly equivalent to a UUID for a user or group) are |
634 | the same returns 1, if they do not match returns 0 */ | |
630f3f0c | 635 | int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) |
297647c2 SF |
636 | { |
637 | int i; | |
638 | int num_subauth, num_sat, num_saw; | |
639 | ||
640 | if ((!ctsid) || (!cwsid)) | |
9409ae58 | 641 | return 1; |
297647c2 SF |
642 | |
643 | /* compare the revision */ | |
9409ae58 SP |
644 | if (ctsid->revision != cwsid->revision) { |
645 | if (ctsid->revision > cwsid->revision) | |
646 | return 1; | |
647 | else | |
648 | return -1; | |
649 | } | |
297647c2 SF |
650 | |
651 | /* compare all of the six auth values */ | |
652 | for (i = 0; i < 6; ++i) { | |
9409ae58 SP |
653 | if (ctsid->authority[i] != cwsid->authority[i]) { |
654 | if (ctsid->authority[i] > cwsid->authority[i]) | |
655 | return 1; | |
656 | else | |
657 | return -1; | |
658 | } | |
297647c2 SF |
659 | } |
660 | ||
661 | /* compare all of the subauth values if any */ | |
adbc0358 | 662 | num_sat = ctsid->num_subauth; |
adddd49d | 663 | num_saw = cwsid->num_subauth; |
297647c2 SF |
664 | num_subauth = num_sat < num_saw ? num_sat : num_saw; |
665 | if (num_subauth) { | |
666 | for (i = 0; i < num_subauth; ++i) { | |
9409ae58 | 667 | if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { |
383c5535 SF |
668 | if (le32_to_cpu(ctsid->sub_auth[i]) > |
669 | le32_to_cpu(cwsid->sub_auth[i])) | |
9409ae58 SP |
670 | return 1; |
671 | else | |
672 | return -1; | |
673 | } | |
297647c2 SF |
674 | } |
675 | } | |
676 | ||
9409ae58 | 677 | return 0; /* sids compare/match */ |
297647c2 SF |
678 | } |
679 | ||
97837582 SF |
680 | |
681 | /* copy ntsd, owner sid, and group sid from a security descriptor to another */ | |
682 | static void copy_sec_desc(const struct cifs_ntsd *pntsd, | |
683 | struct cifs_ntsd *pnntsd, __u32 sidsoffset) | |
684 | { | |
97837582 SF |
685 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
686 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; | |
687 | ||
688 | /* copy security descriptor control portion */ | |
689 | pnntsd->revision = pntsd->revision; | |
690 | pnntsd->type = pntsd->type; | |
691 | pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); | |
692 | pnntsd->sacloffset = 0; | |
693 | pnntsd->osidoffset = cpu_to_le32(sidsoffset); | |
694 | pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); | |
695 | ||
696 | /* copy owner sid */ | |
697 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
698 | le32_to_cpu(pntsd->osidoffset)); | |
699 | nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); | |
36960e44 | 700 | cifs_copy_sid(nowner_sid_ptr, owner_sid_ptr); |
97837582 SF |
701 | |
702 | /* copy group sid */ | |
703 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
704 | le32_to_cpu(pntsd->gsidoffset)); | |
705 | ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + | |
706 | sizeof(struct cifs_sid)); | |
36960e44 | 707 | cifs_copy_sid(ngroup_sid_ptr, group_sid_ptr); |
97837582 SF |
708 | |
709 | return; | |
710 | } | |
711 | ||
712 | ||
630f3f0c SF |
713 | /* |
714 | change posix mode to reflect permissions | |
715 | pmode is the existing mode (we only want to overwrite part of this | |
716 | bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 | |
717 | */ | |
9b5e6857 | 718 | static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
15b03959 | 719 | umode_t *pbits_to_set) |
630f3f0c | 720 | { |
9b5e6857 | 721 | __u32 flags = le32_to_cpu(ace_flags); |
15b03959 | 722 | /* the order of ACEs is important. The canonical order is to begin with |
ce06c9f0 | 723 | DENY entries followed by ALLOW, otherwise an allow entry could be |
15b03959 | 724 | encountered first, making the subsequent deny entry like "dead code" |
ce06c9f0 | 725 | which would be superflous since Windows stops when a match is made |
15b03959 SF |
726 | for the operation you are trying to perform for your user */ |
727 | ||
728 | /* For deny ACEs we change the mask so that subsequent allow access | |
729 | control entries do not turn on the bits we are denying */ | |
730 | if (type == ACCESS_DENIED) { | |
ad7a2926 | 731 | if (flags & GENERIC_ALL) |
15b03959 | 732 | *pbits_to_set &= ~S_IRWXUGO; |
ad7a2926 | 733 | |
9b5e6857 AV |
734 | if ((flags & GENERIC_WRITE) || |
735 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 736 | *pbits_to_set &= ~S_IWUGO; |
9b5e6857 AV |
737 | if ((flags & GENERIC_READ) || |
738 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 739 | *pbits_to_set &= ~S_IRUGO; |
9b5e6857 AV |
740 | if ((flags & GENERIC_EXECUTE) || |
741 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 SF |
742 | *pbits_to_set &= ~S_IXUGO; |
743 | return; | |
744 | } else if (type != ACCESS_ALLOWED) { | |
b6b38f70 | 745 | cERROR(1, "unknown access control type %d", type); |
15b03959 SF |
746 | return; |
747 | } | |
748 | /* else ACCESS_ALLOWED type */ | |
630f3f0c | 749 | |
9b5e6857 | 750 | if (flags & GENERIC_ALL) { |
15b03959 | 751 | *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
b6b38f70 | 752 | cFYI(DBG2, "all perms"); |
d61e5808 SF |
753 | return; |
754 | } | |
9b5e6857 AV |
755 | if ((flags & GENERIC_WRITE) || |
756 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 757 | *pmode |= (S_IWUGO & (*pbits_to_set)); |
9b5e6857 AV |
758 | if ((flags & GENERIC_READ) || |
759 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 760 | *pmode |= (S_IRUGO & (*pbits_to_set)); |
9b5e6857 AV |
761 | if ((flags & GENERIC_EXECUTE) || |
762 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 | 763 | *pmode |= (S_IXUGO & (*pbits_to_set)); |
630f3f0c | 764 | |
b6b38f70 | 765 | cFYI(DBG2, "access flags 0x%x mode now 0x%x", flags, *pmode); |
630f3f0c SF |
766 | return; |
767 | } | |
768 | ||
ce06c9f0 SF |
769 | /* |
770 | Generate access flags to reflect permissions mode is the existing mode. | |
771 | This function is called for every ACE in the DACL whose SID matches | |
772 | with either owner or group or everyone. | |
773 | */ | |
774 | ||
775 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, | |
776 | __u32 *pace_flags) | |
777 | { | |
778 | /* reset access mask */ | |
779 | *pace_flags = 0x0; | |
780 | ||
781 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ | |
782 | mode &= bits_to_use; | |
783 | ||
784 | /* check for R/W/X UGO since we do not know whose flags | |
785 | is this but we have cleared all the bits sans RWX for | |
786 | either user or group or other as per bits_to_use */ | |
787 | if (mode & S_IRUGO) | |
788 | *pace_flags |= SET_FILE_READ_RIGHTS; | |
789 | if (mode & S_IWUGO) | |
790 | *pace_flags |= SET_FILE_WRITE_RIGHTS; | |
791 | if (mode & S_IXUGO) | |
792 | *pace_flags |= SET_FILE_EXEC_RIGHTS; | |
793 | ||
b6b38f70 | 794 | cFYI(DBG2, "mode: 0x%x, access flags now 0x%x", mode, *pace_flags); |
ce06c9f0 SF |
795 | return; |
796 | } | |
797 | ||
2b210adc | 798 | static __u16 fill_ace_for_sid(struct cifs_ace *pntace, |
97837582 SF |
799 | const struct cifs_sid *psid, __u64 nmode, umode_t bits) |
800 | { | |
801 | int i; | |
802 | __u16 size = 0; | |
803 | __u32 access_req = 0; | |
804 | ||
805 | pntace->type = ACCESS_ALLOWED; | |
806 | pntace->flags = 0x0; | |
807 | mode_to_access_flags(nmode, bits, &access_req); | |
808 | if (!access_req) | |
809 | access_req = SET_MINIMUM_RIGHTS; | |
810 | pntace->access_req = cpu_to_le32(access_req); | |
811 | ||
812 | pntace->sid.revision = psid->revision; | |
813 | pntace->sid.num_subauth = psid->num_subauth; | |
814 | for (i = 0; i < 6; i++) | |
815 | pntace->sid.authority[i] = psid->authority[i]; | |
816 | for (i = 0; i < psid->num_subauth; i++) | |
817 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; | |
818 | ||
819 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); | |
820 | pntace->size = cpu_to_le16(size); | |
821 | ||
ef571cad | 822 | return size; |
97837582 SF |
823 | } |
824 | ||
297647c2 | 825 | |
953f8681 SF |
826 | #ifdef CONFIG_CIFS_DEBUG2 |
827 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) | |
d0d66c44 | 828 | { |
d0d66c44 | 829 | int num_subauth; |
d0d66c44 SP |
830 | |
831 | /* validate that we do not go past end of acl */ | |
297647c2 | 832 | |
44093ca2 | 833 | if (le16_to_cpu(pace->size) < 16) { |
b6b38f70 | 834 | cERROR(1, "ACE too small %d", le16_to_cpu(pace->size)); |
44093ca2 SF |
835 | return; |
836 | } | |
837 | ||
838 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
b6b38f70 | 839 | cERROR(1, "ACL too small to parse ACE"); |
d0d66c44 | 840 | return; |
44093ca2 | 841 | } |
d0d66c44 | 842 | |
44093ca2 | 843 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 844 | if (num_subauth) { |
8f18c131 | 845 | int i; |
b6b38f70 | 846 | cFYI(1, "ACE revision %d num_auth %d type %d flags %d size %d", |
44093ca2 | 847 | pace->sid.revision, pace->sid.num_subauth, pace->type, |
b6b38f70 | 848 | pace->flags, le16_to_cpu(pace->size)); |
d12fd121 | 849 | for (i = 0; i < num_subauth; ++i) { |
b6b38f70 JP |
850 | cFYI(1, "ACE sub_auth[%d]: 0x%x", i, |
851 | le32_to_cpu(pace->sid.sub_auth[i])); | |
d12fd121 SF |
852 | } |
853 | ||
854 | /* BB add length check to make sure that we do not have huge | |
855 | num auths and therefore go off the end */ | |
d12fd121 SF |
856 | } |
857 | ||
858 | return; | |
859 | } | |
953f8681 | 860 | #endif |
d12fd121 | 861 | |
d0d66c44 | 862 | |
a750e77c | 863 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 864 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
0b8f18e3 | 865 | struct cifs_fattr *fattr) |
d0d66c44 SP |
866 | { |
867 | int i; | |
868 | int num_aces = 0; | |
869 | int acl_size; | |
870 | char *acl_base; | |
d0d66c44 SP |
871 | struct cifs_ace **ppace; |
872 | ||
873 | /* BB need to add parm so we can store the SID BB */ | |
874 | ||
2b83457b SF |
875 | if (!pdacl) { |
876 | /* no DACL in the security descriptor, set | |
877 | all the permissions for user/group/other */ | |
0b8f18e3 | 878 | fattr->cf_mode |= S_IRWXUGO; |
2b83457b SF |
879 | return; |
880 | } | |
881 | ||
d0d66c44 | 882 | /* validate that we do not go past end of acl */ |
af6f4612 | 883 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
b6b38f70 | 884 | cERROR(1, "ACL too small to parse DACL"); |
d0d66c44 SP |
885 | return; |
886 | } | |
887 | ||
b6b38f70 | 888 | cFYI(DBG2, "DACL revision %d size %d num aces %d", |
af6f4612 | 889 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
b6b38f70 | 890 | le32_to_cpu(pdacl->num_aces)); |
d0d66c44 | 891 | |
7505e052 SF |
892 | /* reset rwx permissions for user/group/other. |
893 | Also, if num_aces is 0 i.e. DACL has no ACEs, | |
894 | user/group/other have no permissions */ | |
0b8f18e3 | 895 | fattr->cf_mode &= ~(S_IRWXUGO); |
7505e052 | 896 | |
d0d66c44 SP |
897 | acl_base = (char *)pdacl; |
898 | acl_size = sizeof(struct cifs_acl); | |
899 | ||
adbc0358 | 900 | num_aces = le32_to_cpu(pdacl->num_aces); |
a5ff3769 | 901 | if (num_aces > 0) { |
15b03959 SF |
902 | umode_t user_mask = S_IRWXU; |
903 | umode_t group_mask = S_IRWXG; | |
2fbc2f17 | 904 | umode_t other_mask = S_IRWXU | S_IRWXG | S_IRWXO; |
15b03959 | 905 | |
7250170c DC |
906 | if (num_aces > ULONG_MAX / sizeof(struct cifs_ace *)) |
907 | return; | |
d0d66c44 SP |
908 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
909 | GFP_KERNEL); | |
8132b65b SF |
910 | if (!ppace) { |
911 | cERROR(1, "DACL memory allocation error"); | |
912 | return; | |
913 | } | |
d0d66c44 | 914 | |
d0d66c44 | 915 | for (i = 0; i < num_aces; ++i) { |
44093ca2 | 916 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
953f8681 SF |
917 | #ifdef CONFIG_CIFS_DEBUG2 |
918 | dump_ace(ppace[i], end_of_acl); | |
919 | #endif | |
9409ae58 | 920 | if (compare_sids(&(ppace[i]->sid), pownersid) == 0) |
e01b6400 | 921 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 922 | ppace[i]->type, |
0b8f18e3 | 923 | &fattr->cf_mode, |
15b03959 | 924 | &user_mask); |
9409ae58 | 925 | if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0) |
e01b6400 | 926 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 927 | ppace[i]->type, |
0b8f18e3 | 928 | &fattr->cf_mode, |
15b03959 | 929 | &group_mask); |
9409ae58 | 930 | if (compare_sids(&(ppace[i]->sid), &sid_everyone) == 0) |
e01b6400 | 931 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 932 | ppace[i]->type, |
0b8f18e3 | 933 | &fattr->cf_mode, |
15b03959 | 934 | &other_mask); |
9409ae58 | 935 | if (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0) |
2fbc2f17 SP |
936 | access_flags_to_mode(ppace[i]->access_req, |
937 | ppace[i]->type, | |
938 | &fattr->cf_mode, | |
939 | &other_mask); | |
940 | ||
e01b6400 | 941 | |
44093ca2 | 942 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
943 | (void *)ppace[i], |
944 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 945 | |
44093ca2 SF |
946 | acl_base = (char *)ppace[i]; |
947 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
948 | } |
949 | ||
950 | kfree(ppace); | |
d0d66c44 SP |
951 | } |
952 | ||
953 | return; | |
954 | } | |
955 | ||
bcb02034 | 956 | |
97837582 SF |
957 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
958 | struct cifs_sid *pgrpsid, __u64 nmode) | |
959 | { | |
2b210adc | 960 | u16 size = 0; |
97837582 SF |
961 | struct cifs_acl *pnndacl; |
962 | ||
963 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); | |
964 | ||
965 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), | |
966 | pownersid, nmode, S_IRWXU); | |
967 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
968 | pgrpsid, nmode, S_IRWXG); | |
969 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
970 | &sid_everyone, nmode, S_IRWXO); | |
971 | ||
972 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); | |
d9f382ef | 973 | pndacl->num_aces = cpu_to_le32(3); |
97837582 | 974 | |
ef571cad | 975 | return 0; |
97837582 SF |
976 | } |
977 | ||
978 | ||
bcb02034 SF |
979 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
980 | { | |
981 | /* BB need to add parm so we can store the SID BB */ | |
982 | ||
b9c7a2bb SF |
983 | /* validate that we do not go past end of ACL - sid must be at least 8 |
984 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
985 | if (end_of_acl < (char *)psid + 8) { | |
b6b38f70 | 986 | cERROR(1, "ACL too small to parse SID %p", psid); |
bcb02034 SF |
987 | return -EINVAL; |
988 | } | |
d0d66c44 | 989 | |
bcb02034 | 990 | #ifdef CONFIG_CIFS_DEBUG2 |
fc03d8a5 | 991 | if (psid->num_subauth) { |
8f18c131 | 992 | int i; |
b6b38f70 JP |
993 | cFYI(1, "SID revision %d num_auth %d", |
994 | psid->revision, psid->num_subauth); | |
bcb02034 | 995 | |
af6f4612 | 996 | for (i = 0; i < psid->num_subauth; i++) { |
b6b38f70 JP |
997 | cFYI(1, "SID sub_auth[%d]: 0x%x ", i, |
998 | le32_to_cpu(psid->sub_auth[i])); | |
d0d66c44 SP |
999 | } |
1000 | ||
d12fd121 | 1001 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 1002 | num auths and therefore go off the end */ |
b6b38f70 JP |
1003 | cFYI(1, "RID 0x%x", |
1004 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1])); | |
d0d66c44 | 1005 | } |
fc03d8a5 | 1006 | #endif |
d0d66c44 | 1007 | |
bcb02034 SF |
1008 | return 0; |
1009 | } | |
1010 | ||
d0d66c44 | 1011 | |
bcb02034 | 1012 | /* Convert CIFS ACL to POSIX form */ |
9409ae58 SP |
1013 | static int parse_sec_desc(struct cifs_sb_info *cifs_sb, |
1014 | struct cifs_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr) | |
bcb02034 | 1015 | { |
9409ae58 | 1016 | int rc = 0; |
bcb02034 SF |
1017 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
1018 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 | 1019 | char *end_of_acl = ((char *)pntsd) + acl_len; |
7505e052 | 1020 | __u32 dacloffset; |
bcb02034 | 1021 | |
0b8f18e3 | 1022 | if (pntsd == NULL) |
b9c7a2bb SF |
1023 | return -EIO; |
1024 | ||
bcb02034 | 1025 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 1026 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 1027 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 1028 | le32_to_cpu(pntsd->gsidoffset)); |
7505e052 | 1029 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
63d2583f | 1030 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
b6b38f70 | 1031 | cFYI(DBG2, "revision %d type 0x%x ooffset 0x%x goffset 0x%x " |
bcb02034 | 1032 | "sacloffset 0x%x dacloffset 0x%x", |
af6f4612 SF |
1033 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
1034 | le32_to_cpu(pntsd->gsidoffset), | |
b6b38f70 | 1035 | le32_to_cpu(pntsd->sacloffset), dacloffset); |
b9c7a2bb | 1036 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 | 1037 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
9409ae58 SP |
1038 | if (rc) { |
1039 | cFYI(1, "%s: Error %d parsing Owner SID", __func__, rc); | |
1040 | return rc; | |
1041 | } | |
1042 | rc = sid_to_id(cifs_sb, owner_sid_ptr, fattr, SIDOWNER); | |
1043 | if (rc) { | |
1044 | cFYI(1, "%s: Error %d mapping Owner SID to uid", __func__, rc); | |
bcb02034 | 1045 | return rc; |
9409ae58 | 1046 | } |
bcb02034 SF |
1047 | |
1048 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
9409ae58 SP |
1049 | if (rc) { |
1050 | cFYI(1, "%s: Error %d mapping Owner SID to gid", __func__, rc); | |
bcb02034 | 1051 | return rc; |
9409ae58 SP |
1052 | } |
1053 | rc = sid_to_id(cifs_sb, group_sid_ptr, fattr, SIDGROUP); | |
1054 | if (rc) { | |
1055 | cFYI(1, "%s: Error %d mapping Group SID to gid", __func__, rc); | |
1056 | return rc; | |
1057 | } | |
bcb02034 | 1058 | |
7505e052 SF |
1059 | if (dacloffset) |
1060 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, | |
0b8f18e3 | 1061 | group_sid_ptr, fattr); |
7505e052 | 1062 | else |
b6b38f70 | 1063 | cFYI(1, "no ACL"); /* BB grant all or default perms? */ |
d0d66c44 | 1064 | |
9409ae58 | 1065 | return rc; |
bcb02034 | 1066 | } |
b9c7a2bb | 1067 | |
97837582 SF |
1068 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
1069 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, | |
a5ff3769 | 1070 | __u32 secdesclen, __u64 nmode, uid_t uid, gid_t gid, int *aclflag) |
97837582 SF |
1071 | { |
1072 | int rc = 0; | |
1073 | __u32 dacloffset; | |
1074 | __u32 ndacloffset; | |
1075 | __u32 sidsoffset; | |
1076 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
a5ff3769 | 1077 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
97837582 SF |
1078 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ |
1079 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ | |
1080 | ||
a5ff3769 SP |
1081 | if (nmode != NO_CHANGE_64) { /* chmod */ |
1082 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
97837582 | 1083 | le32_to_cpu(pntsd->osidoffset)); |
a5ff3769 | 1084 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
97837582 | 1085 | le32_to_cpu(pntsd->gsidoffset)); |
a5ff3769 SP |
1086 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
1087 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); | |
1088 | ndacloffset = sizeof(struct cifs_ntsd); | |
1089 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); | |
1090 | ndacl_ptr->revision = dacl_ptr->revision; | |
1091 | ndacl_ptr->size = 0; | |
1092 | ndacl_ptr->num_aces = 0; | |
1093 | ||
1094 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, | |
1095 | nmode); | |
1096 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); | |
1097 | /* copy sec desc control portion & owner and group sids */ | |
1098 | copy_sec_desc(pntsd, pnntsd, sidsoffset); | |
1099 | *aclflag = CIFS_ACL_DACL; | |
1100 | } else { | |
1101 | memcpy(pnntsd, pntsd, secdesclen); | |
1102 | if (uid != NO_CHANGE_32) { /* chown */ | |
1103 | owner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + | |
1104 | le32_to_cpu(pnntsd->osidoffset)); | |
1105 | nowner_sid_ptr = kmalloc(sizeof(struct cifs_sid), | |
1106 | GFP_KERNEL); | |
1107 | if (!nowner_sid_ptr) | |
1108 | return -ENOMEM; | |
1109 | rc = id_to_sid(uid, SIDOWNER, nowner_sid_ptr); | |
1110 | if (rc) { | |
1111 | cFYI(1, "%s: Mapping error %d for owner id %d", | |
1112 | __func__, rc, uid); | |
1113 | kfree(nowner_sid_ptr); | |
1114 | return rc; | |
1115 | } | |
36960e44 | 1116 | cifs_copy_sid(owner_sid_ptr, nowner_sid_ptr); |
a5ff3769 SP |
1117 | kfree(nowner_sid_ptr); |
1118 | *aclflag = CIFS_ACL_OWNER; | |
1119 | } | |
1120 | if (gid != NO_CHANGE_32) { /* chgrp */ | |
1121 | group_sid_ptr = (struct cifs_sid *)((char *)pnntsd + | |
1122 | le32_to_cpu(pnntsd->gsidoffset)); | |
1123 | ngroup_sid_ptr = kmalloc(sizeof(struct cifs_sid), | |
1124 | GFP_KERNEL); | |
1125 | if (!ngroup_sid_ptr) | |
1126 | return -ENOMEM; | |
1127 | rc = id_to_sid(gid, SIDGROUP, ngroup_sid_ptr); | |
1128 | if (rc) { | |
1129 | cFYI(1, "%s: Mapping error %d for group id %d", | |
1130 | __func__, rc, gid); | |
1131 | kfree(ngroup_sid_ptr); | |
1132 | return rc; | |
1133 | } | |
36960e44 | 1134 | cifs_copy_sid(group_sid_ptr, ngroup_sid_ptr); |
a5ff3769 SP |
1135 | kfree(ngroup_sid_ptr); |
1136 | *aclflag = CIFS_ACL_GROUP; | |
1137 | } | |
1138 | } | |
97837582 | 1139 | |
ef571cad | 1140 | return rc; |
97837582 SF |
1141 | } |
1142 | ||
1bf4072d CH |
1143 | static struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, |
1144 | __u16 fid, u32 *pacllen) | |
b9c7a2bb | 1145 | { |
b9c7a2bb | 1146 | struct cifs_ntsd *pntsd = NULL; |
6d5786a3 PS |
1147 | unsigned int xid; |
1148 | int rc; | |
7ffec372 JL |
1149 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
1150 | ||
1151 | if (IS_ERR(tlink)) | |
987b21d7 | 1152 | return ERR_CAST(tlink); |
b9c7a2bb | 1153 | |
6d5786a3 | 1154 | xid = get_xid(); |
7ffec372 | 1155 | rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), fid, &pntsd, pacllen); |
6d5786a3 | 1156 | free_xid(xid); |
b9c7a2bb | 1157 | |
7ffec372 | 1158 | cifs_put_tlink(tlink); |
b9c7a2bb | 1159 | |
987b21d7 SP |
1160 | cFYI(1, "%s: rc = %d ACL len %d", __func__, rc, *pacllen); |
1161 | if (rc) | |
1162 | return ERR_PTR(rc); | |
1bf4072d CH |
1163 | return pntsd; |
1164 | } | |
8b1327f6 | 1165 | |
1bf4072d CH |
1166 | static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, |
1167 | const char *path, u32 *pacllen) | |
1168 | { | |
1169 | struct cifs_ntsd *pntsd = NULL; | |
1170 | int oplock = 0; | |
6d5786a3 PS |
1171 | unsigned int xid; |
1172 | int rc, create_options = 0; | |
1bf4072d | 1173 | __u16 fid; |
96daf2b0 | 1174 | struct cifs_tcon *tcon; |
7ffec372 JL |
1175 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
1176 | ||
1177 | if (IS_ERR(tlink)) | |
987b21d7 | 1178 | return ERR_CAST(tlink); |
b9c7a2bb | 1179 | |
7ffec372 | 1180 | tcon = tlink_tcon(tlink); |
6d5786a3 | 1181 | xid = get_xid(); |
1bf4072d | 1182 | |
3d3ea8e6 SP |
1183 | if (backup_cred(cifs_sb)) |
1184 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
1185 | ||
1186 | rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, READ_CONTROL, | |
1187 | create_options, &fid, &oplock, NULL, cifs_sb->local_nls, | |
1188 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
987b21d7 SP |
1189 | if (!rc) { |
1190 | rc = CIFSSMBGetCIFSACL(xid, tcon, fid, &pntsd, pacllen); | |
1191 | CIFSSMBClose(xid, tcon, fid); | |
b9c7a2bb SF |
1192 | } |
1193 | ||
7ffec372 | 1194 | cifs_put_tlink(tlink); |
6d5786a3 | 1195 | free_xid(xid); |
987b21d7 SP |
1196 | |
1197 | cFYI(1, "%s: rc = %d ACL len %d", __func__, rc, *pacllen); | |
1198 | if (rc) | |
1199 | return ERR_PTR(rc); | |
7505e052 SF |
1200 | return pntsd; |
1201 | } | |
1202 | ||
1bf4072d | 1203 | /* Retrieve an ACL from the server */ |
fbeba8bb | 1204 | struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb, |
1bf4072d CH |
1205 | struct inode *inode, const char *path, |
1206 | u32 *pacllen) | |
1207 | { | |
1208 | struct cifs_ntsd *pntsd = NULL; | |
1209 | struct cifsFileInfo *open_file = NULL; | |
1210 | ||
1211 | if (inode) | |
6508d904 | 1212 | open_file = find_readable_file(CIFS_I(inode), true); |
1bf4072d CH |
1213 | if (!open_file) |
1214 | return get_cifs_acl_by_path(cifs_sb, path, pacllen); | |
1215 | ||
4b4de76e | 1216 | pntsd = get_cifs_acl_by_fid(cifs_sb, open_file->fid.netfid, pacllen); |
6ab409b5 | 1217 | cifsFileInfo_put(open_file); |
1bf4072d CH |
1218 | return pntsd; |
1219 | } | |
1220 | ||
a5ff3769 SP |
1221 | /* Set an ACL on the server */ |
1222 | int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, | |
1223 | struct inode *inode, const char *path, int aclflag) | |
b96d31a6 CH |
1224 | { |
1225 | int oplock = 0; | |
6d5786a3 PS |
1226 | unsigned int xid; |
1227 | int rc, access_flags, create_options = 0; | |
b96d31a6 | 1228 | __u16 fid; |
96daf2b0 | 1229 | struct cifs_tcon *tcon; |
a5ff3769 | 1230 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
7ffec372 | 1231 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
97837582 | 1232 | |
7ffec372 JL |
1233 | if (IS_ERR(tlink)) |
1234 | return PTR_ERR(tlink); | |
1235 | ||
1236 | tcon = tlink_tcon(tlink); | |
6d5786a3 | 1237 | xid = get_xid(); |
97837582 | 1238 | |
3d3ea8e6 SP |
1239 | if (backup_cred(cifs_sb)) |
1240 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
1241 | ||
a5ff3769 SP |
1242 | if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP) |
1243 | access_flags = WRITE_OWNER; | |
1244 | else | |
1245 | access_flags = WRITE_DAC; | |
1246 | ||
1247 | rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, access_flags, | |
1248 | create_options, &fid, &oplock, NULL, cifs_sb->local_nls, | |
1249 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
b96d31a6 | 1250 | if (rc) { |
b6b38f70 | 1251 | cERROR(1, "Unable to open file to set ACL"); |
b96d31a6 | 1252 | goto out; |
97837582 SF |
1253 | } |
1254 | ||
a5ff3769 | 1255 | rc = CIFSSMBSetCIFSACL(xid, tcon, fid, pnntsd, acllen, aclflag); |
b6b38f70 | 1256 | cFYI(DBG2, "SetCIFSACL rc = %d", rc); |
97837582 | 1257 | |
7ffec372 JL |
1258 | CIFSSMBClose(xid, tcon, fid); |
1259 | out: | |
6d5786a3 | 1260 | free_xid(xid); |
7ffec372 | 1261 | cifs_put_tlink(tlink); |
b96d31a6 CH |
1262 | return rc; |
1263 | } | |
97837582 | 1264 | |
7505e052 | 1265 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ |
987b21d7 | 1266 | int |
0b8f18e3 JL |
1267 | cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, |
1268 | struct inode *inode, const char *path, const __u16 *pfid) | |
7505e052 SF |
1269 | { |
1270 | struct cifs_ntsd *pntsd = NULL; | |
1271 | u32 acllen = 0; | |
1272 | int rc = 0; | |
1273 | ||
b6b38f70 | 1274 | cFYI(DBG2, "converting ACL to mode for %s", path); |
1bf4072d CH |
1275 | |
1276 | if (pfid) | |
1277 | pntsd = get_cifs_acl_by_fid(cifs_sb, *pfid, &acllen); | |
1278 | else | |
1279 | pntsd = get_cifs_acl(cifs_sb, inode, path, &acllen); | |
7505e052 SF |
1280 | |
1281 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ | |
987b21d7 SP |
1282 | if (IS_ERR(pntsd)) { |
1283 | rc = PTR_ERR(pntsd); | |
1284 | cERROR(1, "%s: error %d getting sec desc", __func__, rc); | |
1285 | } else { | |
9409ae58 | 1286 | rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr); |
987b21d7 SP |
1287 | kfree(pntsd); |
1288 | if (rc) | |
1289 | cERROR(1, "parse sec desc failed rc = %d", rc); | |
1290 | } | |
7505e052 | 1291 | |
987b21d7 | 1292 | return rc; |
b9c7a2bb | 1293 | } |
953f8681 | 1294 | |
7505e052 | 1295 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
a5ff3769 SP |
1296 | int |
1297 | id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode, | |
1298 | uid_t uid, gid_t gid) | |
953f8681 SF |
1299 | { |
1300 | int rc = 0; | |
a5ff3769 | 1301 | int aclflag = CIFS_ACL_DACL; /* default flag to set */ |
cce246ee | 1302 | __u32 secdesclen = 0; |
97837582 SF |
1303 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
1304 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ | |
953f8681 | 1305 | |
b6b38f70 | 1306 | cFYI(DBG2, "set ACL from mode for %s", path); |
953f8681 SF |
1307 | |
1308 | /* Get the security descriptor */ | |
1bf4072d | 1309 | pntsd = get_cifs_acl(CIFS_SB(inode->i_sb), inode, path, &secdesclen); |
987b21d7 SP |
1310 | if (IS_ERR(pntsd)) { |
1311 | rc = PTR_ERR(pntsd); | |
1312 | cERROR(1, "%s: error %d getting sec desc", __func__, rc); | |
c78cd838 JL |
1313 | goto out; |
1314 | } | |
7505e052 | 1315 | |
c78cd838 JL |
1316 | /* |
1317 | * Add three ACEs for owner, group, everyone getting rid of other ACEs | |
1318 | * as chmod disables ACEs and set the security descriptor. Allocate | |
1319 | * memory for the smb header, set security descriptor request security | |
1320 | * descriptor parameters, and secuirty descriptor itself | |
1321 | */ | |
1322 | secdesclen = max_t(u32, secdesclen, DEFSECDESCLEN); | |
1323 | pnntsd = kmalloc(secdesclen, GFP_KERNEL); | |
1324 | if (!pnntsd) { | |
1325 | cERROR(1, "Unable to allocate security descriptor"); | |
1326 | kfree(pntsd); | |
1327 | return -ENOMEM; | |
1328 | } | |
97837582 | 1329 | |
c78cd838 JL |
1330 | rc = build_sec_desc(pntsd, pnntsd, secdesclen, nmode, uid, gid, |
1331 | &aclflag); | |
97837582 | 1332 | |
c78cd838 | 1333 | cFYI(DBG2, "build_sec_desc rc: %d", rc); |
97837582 | 1334 | |
c78cd838 JL |
1335 | if (!rc) { |
1336 | /* Set the security descriptor */ | |
1337 | rc = set_cifs_acl(pnntsd, secdesclen, inode, path, aclflag); | |
1338 | cFYI(DBG2, "set_cifs_acl rc: %d", rc); | |
97837582 SF |
1339 | } |
1340 | ||
c78cd838 JL |
1341 | kfree(pnntsd); |
1342 | kfree(pntsd); | |
1343 | out: | |
ef571cad | 1344 | return rc; |
953f8681 | 1345 | } |