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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Common NFSv4 ACL handling code. |
3 | * | |
4 | * Copyright (c) 2002, 2003 The Regents of the University of Michigan. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Marius Aamodt Eriksen <marius@umich.edu> | |
8 | * Jeff Sedlak <jsedlak@umich.edu> | |
9 | * J. Bruce Fields <bfields@umich.edu> | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * 2. Redistributions in binary form must reproduce the above copyright | |
18 | * notice, this list of conditions and the following disclaimer in the | |
19 | * documentation and/or other materials provided with the distribution. | |
20 | * 3. Neither the name of the University nor the names of its | |
21 | * contributors may be used to endorse or promote products derived | |
22 | * from this software without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
27 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
31 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
33 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
34 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 | 38 | #include <linux/nfs_fs.h> |
4ac7249e | 39 | #include "nfsfh.h" |
3554116d | 40 | #include "nfsd.h" |
2ca72e17 | 41 | #include "acl.h" |
4ac7249e | 42 | #include "vfs.h" |
1da177e4 | 43 | |
4ac7249e CH |
44 | #define NFS4_ACL_TYPE_DEFAULT 0x01 |
45 | #define NFS4_ACL_DIR 0x02 | |
46 | #define NFS4_ACL_OWNER 0x04 | |
1da177e4 LT |
47 | |
48 | /* mode bit translations: */ | |
49 | #define NFS4_READ_MODE (NFS4_ACE_READ_DATA) | |
50 | #define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA) | |
51 | #define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE | |
52 | #define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE) | |
53 | #define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL) | |
54 | ||
1da177e4 LT |
55 | /* flags used to simulate posix default ACLs */ |
56 | #define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \ | |
7bdfa68c | 57 | | NFS4_ACE_DIRECTORY_INHERIT_ACE) |
1da177e4 | 58 | |
7bdfa68c BF |
59 | #define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \ |
60 | | NFS4_ACE_INHERIT_ONLY_ACE \ | |
61 | | NFS4_ACE_IDENTIFIER_GROUP) | |
b548edc2 | 62 | |
1da177e4 LT |
63 | static u32 |
64 | mask_from_posix(unsigned short perm, unsigned int flags) | |
65 | { | |
66 | int mask = NFS4_ANYONE_MODE; | |
67 | ||
68 | if (flags & NFS4_ACL_OWNER) | |
69 | mask |= NFS4_OWNER_MODE; | |
70 | if (perm & ACL_READ) | |
71 | mask |= NFS4_READ_MODE; | |
72 | if (perm & ACL_WRITE) | |
73 | mask |= NFS4_WRITE_MODE; | |
74 | if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR)) | |
75 | mask |= NFS4_ACE_DELETE_CHILD; | |
76 | if (perm & ACL_EXECUTE) | |
77 | mask |= NFS4_EXECUTE_MODE; | |
78 | return mask; | |
79 | } | |
80 | ||
81 | static u32 | |
bec50c47 | 82 | deny_mask_from_posix(unsigned short perm, u32 flags) |
1da177e4 | 83 | { |
bec50c47 BF |
84 | u32 mask = 0; |
85 | ||
86 | if (perm & ACL_READ) | |
87 | mask |= NFS4_READ_MODE; | |
88 | if (perm & ACL_WRITE) | |
89 | mask |= NFS4_WRITE_MODE; | |
90 | if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR)) | |
91 | mask |= NFS4_ACE_DELETE_CHILD; | |
92 | if (perm & ACL_EXECUTE) | |
93 | mask |= NFS4_EXECUTE_MODE; | |
94 | return mask; | |
1da177e4 LT |
95 | } |
96 | ||
97 | /* XXX: modify functions to return NFS errors; they're only ever | |
98 | * used by nfs code, after all.... */ | |
99 | ||
09229edb BF |
100 | /* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the |
101 | * side of being more restrictive, so the mode bit mapping below is | |
102 | * pessimistic. An optimistic version would be needed to handle DENY's, | |
103 | * but we espect to coalesce all ALLOWs and DENYs before mapping to mode | |
104 | * bits. */ | |
105 | ||
106 | static void | |
107 | low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags) | |
1da177e4 | 108 | { |
09229edb | 109 | u32 write_mode = NFS4_WRITE_MODE; |
1da177e4 | 110 | |
09229edb BF |
111 | if (flags & NFS4_ACL_DIR) |
112 | write_mode |= NFS4_ACE_DELETE_CHILD; | |
1da177e4 LT |
113 | *mode = 0; |
114 | if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE) | |
115 | *mode |= ACL_READ; | |
09229edb | 116 | if ((perm & write_mode) == write_mode) |
1da177e4 LT |
117 | *mode |= ACL_WRITE; |
118 | if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE) | |
119 | *mode |= ACL_EXECUTE; | |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 | 122 | static short ace2type(struct nfs4_ace *); |
28e05dd8 BF |
123 | static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, |
124 | unsigned int); | |
1da177e4 | 125 | |
4ac7249e CH |
126 | int |
127 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, | |
128 | struct nfs4_acl **acl) | |
1da177e4 | 129 | { |
2b0143b5 | 130 | struct inode *inode = d_inode(dentry); |
4ac7249e CH |
131 | int error = 0; |
132 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
133 | unsigned int flags = 0; | |
28e05dd8 | 134 | int size = 0; |
1da177e4 | 135 | |
4ac7249e | 136 | pacl = get_acl(inode, ACL_TYPE_ACCESS); |
35e634b8 | 137 | if (!pacl) |
4ac7249e | 138 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
35e634b8 KM |
139 | |
140 | if (IS_ERR(pacl)) | |
141 | return PTR_ERR(pacl); | |
142 | ||
09bdc2d7 BF |
143 | /* allocate for worst case: one (deny, allow) pair each: */ |
144 | size += 2 * pacl->a_count; | |
4ac7249e CH |
145 | |
146 | if (S_ISDIR(inode->i_mode)) { | |
147 | flags = NFS4_ACL_DIR; | |
148 | dpacl = get_acl(inode, ACL_TYPE_DEFAULT); | |
35e634b8 KM |
149 | if (IS_ERR(dpacl)) { |
150 | error = PTR_ERR(dpacl); | |
151 | goto rel_pacl; | |
152 | } | |
153 | ||
4ac7249e CH |
154 | if (dpacl) |
155 | size += 2 * dpacl->a_count; | |
1da177e4 LT |
156 | } |
157 | ||
bcaab953 | 158 | *acl = kmalloc(nfs4_acl_bytes(size), GFP_KERNEL); |
4ac7249e CH |
159 | if (*acl == NULL) { |
160 | error = -ENOMEM; | |
161 | goto out; | |
162 | } | |
bcaab953 | 163 | (*acl)->naces = 0; |
1da177e4 | 164 | |
09bdc2d7 | 165 | _posix_to_nfsv4_one(pacl, *acl, flags & ~NFS4_ACL_TYPE_DEFAULT); |
1da177e4 | 166 | |
28e05dd8 | 167 | if (dpacl) |
4ac7249e | 168 | _posix_to_nfsv4_one(dpacl, *acl, flags | NFS4_ACL_TYPE_DEFAULT); |
1da177e4 | 169 | |
35e634b8 | 170 | out: |
4ac7249e | 171 | posix_acl_release(dpacl); |
35e634b8 KM |
172 | rel_pacl: |
173 | posix_acl_release(pacl); | |
4ac7249e | 174 | return error; |
1da177e4 LT |
175 | } |
176 | ||
bec50c47 BF |
177 | struct posix_acl_summary { |
178 | unsigned short owner; | |
179 | unsigned short users; | |
180 | unsigned short group; | |
181 | unsigned short groups; | |
182 | unsigned short other; | |
183 | unsigned short mask; | |
184 | }; | |
185 | ||
28e05dd8 | 186 | static void |
bec50c47 | 187 | summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas) |
1da177e4 | 188 | { |
bec50c47 | 189 | struct posix_acl_entry *pa, *pe; |
f7fede4b BF |
190 | |
191 | /* | |
192 | * Only pas.users and pas.groups need initialization; previous | |
193 | * posix_acl_valid() calls ensure that the other fields will be | |
194 | * initialized in the following loop. But, just to placate gcc: | |
195 | */ | |
196 | memset(pas, 0, sizeof(*pas)); | |
bec50c47 BF |
197 | pas->mask = 07; |
198 | ||
199 | pe = acl->a_entries + acl->a_count; | |
200 | ||
201 | FOREACH_ACL_ENTRY(pa, acl, pe) { | |
202 | switch (pa->e_tag) { | |
203 | case ACL_USER_OBJ: | |
204 | pas->owner = pa->e_perm; | |
205 | break; | |
206 | case ACL_GROUP_OBJ: | |
207 | pas->group = pa->e_perm; | |
208 | break; | |
209 | case ACL_USER: | |
210 | pas->users |= pa->e_perm; | |
211 | break; | |
212 | case ACL_GROUP: | |
213 | pas->groups |= pa->e_perm; | |
214 | break; | |
215 | case ACL_OTHER: | |
216 | pas->other = pa->e_perm; | |
217 | break; | |
218 | case ACL_MASK: | |
219 | pas->mask = pa->e_perm; | |
220 | break; | |
221 | } | |
222 | } | |
223 | /* We'll only care about effective permissions: */ | |
224 | pas->users &= pas->mask; | |
225 | pas->group &= pas->mask; | |
226 | pas->groups &= pas->mask; | |
1da177e4 LT |
227 | } |
228 | ||
229 | /* We assume the acl has been verified with posix_acl_valid. */ | |
28e05dd8 | 230 | static void |
1da177e4 LT |
231 | _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl, |
232 | unsigned int flags) | |
233 | { | |
bec50c47 BF |
234 | struct posix_acl_entry *pa, *group_owner_entry; |
235 | struct nfs4_ace *ace; | |
236 | struct posix_acl_summary pas; | |
237 | unsigned short deny; | |
1da177e4 | 238 | int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ? |
54c04409 | 239 | NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0); |
1da177e4 LT |
240 | |
241 | BUG_ON(pacl->a_count < 3); | |
bec50c47 | 242 | summarize_posix_acl(pacl, &pas); |
1da177e4 LT |
243 | |
244 | pa = pacl->a_entries; | |
bec50c47 BF |
245 | ace = acl->aces + acl->naces; |
246 | ||
247 | /* We could deny everything not granted by the owner: */ | |
248 | deny = ~pas.owner; | |
249 | /* | |
250 | * but it is equivalent (and simpler) to deny only what is not | |
251 | * granted by later entries: | |
252 | */ | |
253 | deny &= pas.users | pas.group | pas.groups | pas.other; | |
254 | if (deny) { | |
255 | ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; | |
256 | ace->flag = eflag; | |
257 | ace->access_mask = deny_mask_from_posix(deny, flags); | |
258 | ace->whotype = NFS4_ACL_WHO_OWNER; | |
259 | ace++; | |
260 | acl->naces++; | |
261 | } | |
262 | ||
263 | ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; | |
264 | ace->flag = eflag; | |
265 | ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER); | |
266 | ace->whotype = NFS4_ACL_WHO_OWNER; | |
267 | ace++; | |
268 | acl->naces++; | |
1da177e4 LT |
269 | pa++; |
270 | ||
271 | while (pa->e_tag == ACL_USER) { | |
bec50c47 BF |
272 | deny = ~(pa->e_perm & pas.mask); |
273 | deny &= pas.groups | pas.group | pas.other; | |
274 | if (deny) { | |
275 | ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; | |
276 | ace->flag = eflag; | |
277 | ace->access_mask = deny_mask_from_posix(deny, flags); | |
278 | ace->whotype = NFS4_ACL_WHO_NAMED; | |
ab8e4aee | 279 | ace->who_uid = pa->e_uid; |
bec50c47 BF |
280 | ace++; |
281 | acl->naces++; | |
282 | } | |
283 | ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; | |
284 | ace->flag = eflag; | |
285 | ace->access_mask = mask_from_posix(pa->e_perm & pas.mask, | |
286 | flags); | |
287 | ace->whotype = NFS4_ACL_WHO_NAMED; | |
ab8e4aee | 288 | ace->who_uid = pa->e_uid; |
bec50c47 BF |
289 | ace++; |
290 | acl->naces++; | |
1da177e4 LT |
291 | pa++; |
292 | } | |
293 | ||
294 | /* In the case of groups, we apply allow ACEs first, then deny ACEs, | |
295 | * since a user can be in more than one group. */ | |
296 | ||
297 | /* allow ACEs */ | |
298 | ||
1da177e4 | 299 | group_owner_entry = pa; |
bec50c47 BF |
300 | |
301 | ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; | |
302 | ace->flag = eflag; | |
303 | ace->access_mask = mask_from_posix(pas.group, flags); | |
304 | ace->whotype = NFS4_ACL_WHO_GROUP; | |
305 | ace++; | |
306 | acl->naces++; | |
1da177e4 LT |
307 | pa++; |
308 | ||
309 | while (pa->e_tag == ACL_GROUP) { | |
bec50c47 BF |
310 | ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; |
311 | ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP; | |
312 | ace->access_mask = mask_from_posix(pa->e_perm & pas.mask, | |
313 | flags); | |
314 | ace->whotype = NFS4_ACL_WHO_NAMED; | |
ab8e4aee | 315 | ace->who_gid = pa->e_gid; |
bec50c47 BF |
316 | ace++; |
317 | acl->naces++; | |
1da177e4 LT |
318 | pa++; |
319 | } | |
320 | ||
321 | /* deny ACEs */ | |
322 | ||
323 | pa = group_owner_entry; | |
bec50c47 BF |
324 | |
325 | deny = ~pas.group & pas.other; | |
326 | if (deny) { | |
327 | ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; | |
d8d0b85b | 328 | ace->flag = eflag; |
bec50c47 BF |
329 | ace->access_mask = deny_mask_from_posix(deny, flags); |
330 | ace->whotype = NFS4_ACL_WHO_GROUP; | |
331 | ace++; | |
332 | acl->naces++; | |
333 | } | |
1da177e4 | 334 | pa++; |
bec50c47 | 335 | |
1da177e4 | 336 | while (pa->e_tag == ACL_GROUP) { |
bec50c47 BF |
337 | deny = ~(pa->e_perm & pas.mask); |
338 | deny &= pas.other; | |
339 | if (deny) { | |
340 | ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; | |
341 | ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP; | |
55bb55dc | 342 | ace->access_mask = deny_mask_from_posix(deny, flags); |
bec50c47 | 343 | ace->whotype = NFS4_ACL_WHO_NAMED; |
ab8e4aee | 344 | ace->who_gid = pa->e_gid; |
bec50c47 BF |
345 | ace++; |
346 | acl->naces++; | |
347 | } | |
1da177e4 LT |
348 | pa++; |
349 | } | |
350 | ||
351 | if (pa->e_tag == ACL_MASK) | |
352 | pa++; | |
bec50c47 BF |
353 | ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; |
354 | ace->flag = eflag; | |
355 | ace->access_mask = mask_from_posix(pa->e_perm, flags); | |
356 | ace->whotype = NFS4_ACL_WHO_EVERYONE; | |
357 | acl->naces++; | |
1da177e4 LT |
358 | } |
359 | ||
ab8e4aee EB |
360 | static bool |
361 | pace_gt(struct posix_acl_entry *pace1, struct posix_acl_entry *pace2) | |
362 | { | |
363 | if (pace1->e_tag != pace2->e_tag) | |
364 | return pace1->e_tag > pace2->e_tag; | |
365 | if (pace1->e_tag == ACL_USER) | |
366 | return uid_gt(pace1->e_uid, pace2->e_uid); | |
367 | if (pace1->e_tag == ACL_GROUP) | |
368 | return gid_gt(pace1->e_gid, pace2->e_gid); | |
369 | return false; | |
370 | } | |
371 | ||
1da177e4 LT |
372 | static void |
373 | sort_pacl_range(struct posix_acl *pacl, int start, int end) { | |
374 | int sorted = 0, i; | |
1da177e4 LT |
375 | |
376 | /* We just do a bubble sort; easy to do in place, and we're not | |
377 | * expecting acl's to be long enough to justify anything more. */ | |
378 | while (!sorted) { | |
379 | sorted = 1; | |
380 | for (i = start; i < end; i++) { | |
ab8e4aee EB |
381 | if (pace_gt(&pacl->a_entries[i], |
382 | &pacl->a_entries[i+1])) { | |
1da177e4 | 383 | sorted = 0; |
97b1f9aa FF |
384 | swap(pacl->a_entries[i], |
385 | pacl->a_entries[i + 1]); | |
1da177e4 LT |
386 | } |
387 | } | |
388 | } | |
389 | } | |
390 | ||
391 | static void | |
392 | sort_pacl(struct posix_acl *pacl) | |
393 | { | |
394 | /* posix_acl_valid requires that users and groups be in order | |
395 | * by uid/gid. */ | |
396 | int i, j; | |
397 | ||
aa07c713 KM |
398 | /* no users or groups */ |
399 | if (!pacl || pacl->a_count <= 4) | |
400 | return; | |
401 | ||
1da177e4 LT |
402 | i = 1; |
403 | while (pacl->a_entries[i].e_tag == ACL_USER) | |
404 | i++; | |
405 | sort_pacl_range(pacl, 1, i-1); | |
406 | ||
407 | BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ); | |
aba24d71 | 408 | j = ++i; |
1da177e4 LT |
409 | while (pacl->a_entries[j].e_tag == ACL_GROUP) |
410 | j++; | |
411 | sort_pacl_range(pacl, i, j-1); | |
412 | return; | |
413 | } | |
414 | ||
09229edb BF |
415 | /* |
416 | * While processing the NFSv4 ACE, this maintains bitmasks representing | |
417 | * which permission bits have been allowed and which denied to a given | |
418 | * entity: */ | |
419 | struct posix_ace_state { | |
420 | u32 allow; | |
421 | u32 deny; | |
422 | }; | |
423 | ||
424 | struct posix_user_ace_state { | |
ab8e4aee EB |
425 | union { |
426 | kuid_t uid; | |
427 | kgid_t gid; | |
428 | }; | |
09229edb BF |
429 | struct posix_ace_state perms; |
430 | }; | |
431 | ||
432 | struct posix_ace_state_array { | |
433 | int n; | |
434 | struct posix_user_ace_state aces[]; | |
435 | }; | |
436 | ||
437 | /* | |
438 | * While processing the NFSv4 ACE, this maintains the partial permissions | |
439 | * calculated so far: */ | |
440 | ||
441 | struct posix_acl_state { | |
3160a711 | 442 | int empty; |
09229edb BF |
443 | struct posix_ace_state owner; |
444 | struct posix_ace_state group; | |
445 | struct posix_ace_state other; | |
446 | struct posix_ace_state everyone; | |
447 | struct posix_ace_state mask; /* Deny unused in this case */ | |
448 | struct posix_ace_state_array *users; | |
449 | struct posix_ace_state_array *groups; | |
450 | }; | |
451 | ||
1da177e4 | 452 | static int |
09229edb | 453 | init_state(struct posix_acl_state *state, int cnt) |
1da177e4 | 454 | { |
09229edb BF |
455 | int alloc; |
456 | ||
457 | memset(state, 0, sizeof(struct posix_acl_state)); | |
3160a711 | 458 | state->empty = 1; |
09229edb BF |
459 | /* |
460 | * In the worst case, each individual acl could be for a distinct | |
461 | * named user or group, but we don't no which, so we allocate | |
462 | * enough space for either: | |
463 | */ | |
464 | alloc = sizeof(struct posix_ace_state_array) | |
91b80969 | 465 | + cnt*sizeof(struct posix_user_ace_state); |
09229edb BF |
466 | state->users = kzalloc(alloc, GFP_KERNEL); |
467 | if (!state->users) | |
468 | return -ENOMEM; | |
469 | state->groups = kzalloc(alloc, GFP_KERNEL); | |
470 | if (!state->groups) { | |
471 | kfree(state->users); | |
472 | return -ENOMEM; | |
473 | } | |
474 | return 0; | |
1da177e4 LT |
475 | } |
476 | ||
09229edb BF |
477 | static void |
478 | free_state(struct posix_acl_state *state) { | |
479 | kfree(state->users); | |
480 | kfree(state->groups); | |
1da177e4 LT |
481 | } |
482 | ||
09229edb | 483 | static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate) |
1da177e4 | 484 | { |
09229edb | 485 | state->mask.allow |= astate->allow; |
1da177e4 LT |
486 | } |
487 | ||
09229edb BF |
488 | static struct posix_acl * |
489 | posix_state_to_acl(struct posix_acl_state *state, unsigned int flags) | |
1da177e4 | 490 | { |
09229edb BF |
491 | struct posix_acl_entry *pace; |
492 | struct posix_acl *pacl; | |
493 | int nace; | |
b14f4f7e | 494 | int i; |
1da177e4 | 495 | |
3160a711 BF |
496 | /* |
497 | * ACLs with no ACEs are treated differently in the inheritable | |
aa07c713 KM |
498 | * and effective cases: when there are no inheritable ACEs, |
499 | * calls ->set_acl with a NULL ACL structure. | |
3160a711 | 500 | */ |
aa07c713 KM |
501 | if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) |
502 | return NULL; | |
503 | ||
3160a711 BF |
504 | /* |
505 | * When there are no effective ACEs, the following will end | |
506 | * up setting a 3-element effective posix ACL with all | |
507 | * permissions zero. | |
508 | */ | |
06f9cc12 BF |
509 | if (!state->users->n && !state->groups->n) |
510 | nace = 3; | |
511 | else /* Note we also include a MASK ACE in this case: */ | |
512 | nace = 4 + state->users->n + state->groups->n; | |
09229edb BF |
513 | pacl = posix_acl_alloc(nace, GFP_KERNEL); |
514 | if (!pacl) | |
515 | return ERR_PTR(-ENOMEM); | |
1da177e4 | 516 | |
09229edb BF |
517 | pace = pacl->a_entries; |
518 | pace->e_tag = ACL_USER_OBJ; | |
09229edb | 519 | low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags); |
09229edb BF |
520 | |
521 | for (i=0; i < state->users->n; i++) { | |
522 | pace++; | |
523 | pace->e_tag = ACL_USER; | |
09229edb BF |
524 | low_mode_from_nfs4(state->users->aces[i].perms.allow, |
525 | &pace->e_perm, flags); | |
ab8e4aee | 526 | pace->e_uid = state->users->aces[i].uid; |
09229edb | 527 | add_to_mask(state, &state->users->aces[i].perms); |
1da177e4 LT |
528 | } |
529 | ||
09229edb BF |
530 | pace++; |
531 | pace->e_tag = ACL_GROUP_OBJ; | |
09229edb | 532 | low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags); |
09229edb BF |
533 | add_to_mask(state, &state->group); |
534 | ||
535 | for (i=0; i < state->groups->n; i++) { | |
536 | pace++; | |
537 | pace->e_tag = ACL_GROUP; | |
09229edb BF |
538 | low_mode_from_nfs4(state->groups->aces[i].perms.allow, |
539 | &pace->e_perm, flags); | |
ab8e4aee | 540 | pace->e_gid = state->groups->aces[i].gid; |
09229edb BF |
541 | add_to_mask(state, &state->groups->aces[i].perms); |
542 | } | |
1da177e4 | 543 | |
5513a510 | 544 | if (state->users->n || state->groups->n) { |
06f9cc12 BF |
545 | pace++; |
546 | pace->e_tag = ACL_MASK; | |
547 | low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags); | |
548 | } | |
1da177e4 | 549 | |
09229edb BF |
550 | pace++; |
551 | pace->e_tag = ACL_OTHER; | |
09229edb | 552 | low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags); |
1da177e4 | 553 | |
09229edb | 554 | return pacl; |
09229edb | 555 | } |
1da177e4 | 556 | |
09229edb BF |
557 | static inline void allow_bits(struct posix_ace_state *astate, u32 mask) |
558 | { | |
559 | /* Allow all bits in the mask not already denied: */ | |
560 | astate->allow |= mask & ~astate->deny; | |
561 | } | |
1da177e4 | 562 | |
09229edb BF |
563 | static inline void deny_bits(struct posix_ace_state *astate, u32 mask) |
564 | { | |
565 | /* Deny all bits in the mask not already allowed: */ | |
566 | astate->deny |= mask & ~astate->allow; | |
567 | } | |
1da177e4 | 568 | |
ab8e4aee | 569 | static int find_uid(struct posix_acl_state *state, kuid_t uid) |
09229edb | 570 | { |
ab8e4aee | 571 | struct posix_ace_state_array *a = state->users; |
09229edb | 572 | int i; |
1da177e4 | 573 | |
09229edb | 574 | for (i = 0; i < a->n; i++) |
ab8e4aee | 575 | if (uid_eq(a->aces[i].uid, uid)) |
09229edb BF |
576 | return i; |
577 | /* Not found: */ | |
578 | a->n++; | |
579 | a->aces[i].uid = uid; | |
580 | a->aces[i].perms.allow = state->everyone.allow; | |
581 | a->aces[i].perms.deny = state->everyone.deny; | |
1da177e4 | 582 | |
09229edb | 583 | return i; |
1da177e4 LT |
584 | } |
585 | ||
ab8e4aee EB |
586 | static int find_gid(struct posix_acl_state *state, kgid_t gid) |
587 | { | |
588 | struct posix_ace_state_array *a = state->groups; | |
589 | int i; | |
590 | ||
591 | for (i = 0; i < a->n; i++) | |
592 | if (gid_eq(a->aces[i].gid, gid)) | |
593 | return i; | |
594 | /* Not found: */ | |
595 | a->n++; | |
596 | a->aces[i].gid = gid; | |
597 | a->aces[i].perms.allow = state->everyone.allow; | |
598 | a->aces[i].perms.deny = state->everyone.deny; | |
599 | ||
600 | return i; | |
601 | } | |
602 | ||
09229edb | 603 | static void deny_bits_array(struct posix_ace_state_array *a, u32 mask) |
1da177e4 | 604 | { |
09229edb | 605 | int i; |
1da177e4 | 606 | |
09229edb BF |
607 | for (i=0; i < a->n; i++) |
608 | deny_bits(&a->aces[i].perms, mask); | |
1da177e4 LT |
609 | } |
610 | ||
09229edb | 611 | static void allow_bits_array(struct posix_ace_state_array *a, u32 mask) |
1da177e4 | 612 | { |
09229edb | 613 | int i; |
1da177e4 | 614 | |
09229edb BF |
615 | for (i=0; i < a->n; i++) |
616 | allow_bits(&a->aces[i].perms, mask); | |
1da177e4 LT |
617 | } |
618 | ||
09229edb BF |
619 | static void process_one_v4_ace(struct posix_acl_state *state, |
620 | struct nfs4_ace *ace) | |
1da177e4 | 621 | { |
09229edb BF |
622 | u32 mask = ace->access_mask; |
623 | int i; | |
624 | ||
3160a711 BF |
625 | state->empty = 0; |
626 | ||
09229edb BF |
627 | switch (ace2type(ace)) { |
628 | case ACL_USER_OBJ: | |
629 | if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { | |
630 | allow_bits(&state->owner, mask); | |
631 | } else { | |
632 | deny_bits(&state->owner, mask); | |
633 | } | |
634 | break; | |
635 | case ACL_USER: | |
ab8e4aee | 636 | i = find_uid(state, ace->who_uid); |
09229edb BF |
637 | if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
638 | allow_bits(&state->users->aces[i].perms, mask); | |
639 | } else { | |
640 | deny_bits(&state->users->aces[i].perms, mask); | |
641 | mask = state->users->aces[i].perms.deny; | |
642 | deny_bits(&state->owner, mask); | |
643 | } | |
644 | break; | |
645 | case ACL_GROUP_OBJ: | |
646 | if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { | |
647 | allow_bits(&state->group, mask); | |
648 | } else { | |
649 | deny_bits(&state->group, mask); | |
650 | mask = state->group.deny; | |
651 | deny_bits(&state->owner, mask); | |
652 | deny_bits(&state->everyone, mask); | |
653 | deny_bits_array(state->users, mask); | |
654 | deny_bits_array(state->groups, mask); | |
655 | } | |
656 | break; | |
657 | case ACL_GROUP: | |
ab8e4aee | 658 | i = find_gid(state, ace->who_gid); |
09229edb BF |
659 | if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
660 | allow_bits(&state->groups->aces[i].perms, mask); | |
661 | } else { | |
662 | deny_bits(&state->groups->aces[i].perms, mask); | |
663 | mask = state->groups->aces[i].perms.deny; | |
664 | deny_bits(&state->owner, mask); | |
665 | deny_bits(&state->group, mask); | |
666 | deny_bits(&state->everyone, mask); | |
667 | deny_bits_array(state->users, mask); | |
668 | deny_bits_array(state->groups, mask); | |
669 | } | |
670 | break; | |
671 | case ACL_OTHER: | |
672 | if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { | |
673 | allow_bits(&state->owner, mask); | |
674 | allow_bits(&state->group, mask); | |
675 | allow_bits(&state->other, mask); | |
676 | allow_bits(&state->everyone, mask); | |
677 | allow_bits_array(state->users, mask); | |
678 | allow_bits_array(state->groups, mask); | |
679 | } else { | |
680 | deny_bits(&state->owner, mask); | |
681 | deny_bits(&state->group, mask); | |
682 | deny_bits(&state->other, mask); | |
683 | deny_bits(&state->everyone, mask); | |
684 | deny_bits_array(state->users, mask); | |
685 | deny_bits_array(state->groups, mask); | |
686 | } | |
1da177e4 LT |
687 | } |
688 | } | |
689 | ||
4ac7249e CH |
690 | static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, |
691 | struct posix_acl **pacl, struct posix_acl **dpacl, | |
692 | unsigned int flags) | |
1da177e4 | 693 | { |
575a6290 | 694 | struct posix_acl_state effective_acl_state, default_acl_state; |
09229edb BF |
695 | struct nfs4_ace *ace; |
696 | int ret; | |
1da177e4 | 697 | |
575a6290 | 698 | ret = init_state(&effective_acl_state, acl->naces); |
09229edb | 699 | if (ret) |
575a6290 BF |
700 | return ret; |
701 | ret = init_state(&default_acl_state, acl->naces); | |
702 | if (ret) | |
703 | goto out_estate; | |
704 | ret = -EINVAL; | |
28e05dd8 | 705 | for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { |
09229edb BF |
706 | if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE && |
707 | ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE) | |
575a6290 | 708 | goto out_dstate; |
b548edc2 | 709 | if (ace->flag & ~NFS4_SUPPORTED_FLAGS) |
575a6290 | 710 | goto out_dstate; |
7bdfa68c | 711 | if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) { |
575a6290 | 712 | process_one_v4_ace(&effective_acl_state, ace); |
b548edc2 | 713 | continue; |
7bdfa68c | 714 | } |
575a6290 BF |
715 | if (!(flags & NFS4_ACL_DIR)) |
716 | goto out_dstate; | |
7bdfa68c BF |
717 | /* |
718 | * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT | |
719 | * is set, we're effectively turning on the other. That's OK, | |
720 | * according to rfc 3530. | |
721 | */ | |
575a6290 BF |
722 | process_one_v4_ace(&default_acl_state, ace); |
723 | ||
724 | if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE)) | |
725 | process_one_v4_ace(&effective_acl_state, ace); | |
1da177e4 | 726 | } |
575a6290 BF |
727 | *pacl = posix_state_to_acl(&effective_acl_state, flags); |
728 | if (IS_ERR(*pacl)) { | |
729 | ret = PTR_ERR(*pacl); | |
4b2ca38a | 730 | *pacl = NULL; |
575a6290 BF |
731 | goto out_dstate; |
732 | } | |
3160a711 BF |
733 | *dpacl = posix_state_to_acl(&default_acl_state, |
734 | flags | NFS4_ACL_TYPE_DEFAULT); | |
575a6290 BF |
735 | if (IS_ERR(*dpacl)) { |
736 | ret = PTR_ERR(*dpacl); | |
4b2ca38a | 737 | *dpacl = NULL; |
575a6290 | 738 | posix_acl_release(*pacl); |
4b2ca38a | 739 | *pacl = NULL; |
575a6290 BF |
740 | goto out_dstate; |
741 | } | |
742 | sort_pacl(*pacl); | |
743 | sort_pacl(*dpacl); | |
744 | ret = 0; | |
745 | out_dstate: | |
746 | free_state(&default_acl_state); | |
747 | out_estate: | |
748 | free_state(&effective_acl_state); | |
749 | return ret; | |
1da177e4 LT |
750 | } |
751 | ||
4ac7249e CH |
752 | __be32 |
753 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
754 | struct nfs4_acl *acl) | |
755 | { | |
756 | __be32 error; | |
757 | int host_error; | |
758 | struct dentry *dentry; | |
759 | struct inode *inode; | |
760 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
761 | unsigned int flags = 0; | |
762 | ||
763 | /* Get inode */ | |
764 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR); | |
765 | if (error) | |
766 | return error; | |
767 | ||
768 | dentry = fhp->fh_dentry; | |
2b0143b5 | 769 | inode = d_inode(dentry); |
4ac7249e CH |
770 | |
771 | if (!inode->i_op->set_acl || !IS_POSIXACL(inode)) | |
772 | return nfserr_attrnotsupp; | |
773 | ||
774 | if (S_ISDIR(inode->i_mode)) | |
775 | flags = NFS4_ACL_DIR; | |
776 | ||
777 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); | |
778 | if (host_error == -EINVAL) | |
779 | return nfserr_attrnotsupp; | |
780 | if (host_error < 0) | |
781 | goto out_nfserr; | |
782 | ||
783 | host_error = inode->i_op->set_acl(inode, pacl, ACL_TYPE_ACCESS); | |
784 | if (host_error < 0) | |
785 | goto out_release; | |
786 | ||
787 | if (S_ISDIR(inode->i_mode)) { | |
788 | host_error = inode->i_op->set_acl(inode, dpacl, | |
789 | ACL_TYPE_DEFAULT); | |
790 | } | |
791 | ||
792 | out_release: | |
793 | posix_acl_release(pacl); | |
794 | posix_acl_release(dpacl); | |
795 | out_nfserr: | |
796 | if (host_error == -EOPNOTSUPP) | |
797 | return nfserr_attrnotsupp; | |
798 | else | |
799 | return nfserrno(host_error); | |
800 | } | |
801 | ||
802 | ||
1da177e4 LT |
803 | static short |
804 | ace2type(struct nfs4_ace *ace) | |
805 | { | |
806 | switch (ace->whotype) { | |
807 | case NFS4_ACL_WHO_NAMED: | |
808 | return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ? | |
809 | ACL_GROUP : ACL_USER); | |
810 | case NFS4_ACL_WHO_OWNER: | |
811 | return ACL_USER_OBJ; | |
812 | case NFS4_ACL_WHO_GROUP: | |
813 | return ACL_GROUP_OBJ; | |
814 | case NFS4_ACL_WHO_EVERYONE: | |
815 | return ACL_OTHER; | |
816 | } | |
817 | BUG(); | |
818 | return -1; | |
819 | } | |
820 | ||
bcaab953 BF |
821 | /* |
822 | * return the size of the struct nfs4_acl required to represent an acl | |
823 | * with @entries entries. | |
824 | */ | |
825 | int nfs4_acl_bytes(int entries) | |
1da177e4 | 826 | { |
bcaab953 | 827 | return sizeof(struct nfs4_acl) + entries * sizeof(struct nfs4_ace); |
1da177e4 LT |
828 | } |
829 | ||
1da177e4 LT |
830 | static struct { |
831 | char *string; | |
832 | int stringlen; | |
833 | int type; | |
834 | } s2t_map[] = { | |
835 | { | |
836 | .string = "OWNER@", | |
837 | .stringlen = sizeof("OWNER@") - 1, | |
838 | .type = NFS4_ACL_WHO_OWNER, | |
839 | }, | |
840 | { | |
841 | .string = "GROUP@", | |
842 | .stringlen = sizeof("GROUP@") - 1, | |
843 | .type = NFS4_ACL_WHO_GROUP, | |
844 | }, | |
845 | { | |
846 | .string = "EVERYONE@", | |
847 | .stringlen = sizeof("EVERYONE@") - 1, | |
848 | .type = NFS4_ACL_WHO_EVERYONE, | |
849 | }, | |
850 | }; | |
851 | ||
852 | int | |
853 | nfs4_acl_get_whotype(char *p, u32 len) | |
854 | { | |
855 | int i; | |
856 | ||
e8c96f8c | 857 | for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { |
1da177e4 LT |
858 | if (s2t_map[i].stringlen == len && |
859 | 0 == memcmp(s2t_map[i].string, p, len)) | |
860 | return s2t_map[i].type; | |
861 | } | |
862 | return NFS4_ACL_WHO_NAMED; | |
863 | } | |
864 | ||
ddd1ea56 | 865 | __be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who) |
1da177e4 | 866 | { |
ddd1ea56 | 867 | __be32 *p; |
1da177e4 LT |
868 | int i; |
869 | ||
e8c96f8c | 870 | for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { |
3554116d BF |
871 | if (s2t_map[i].type != who) |
872 | continue; | |
ddd1ea56 BF |
873 | p = xdr_reserve_space(xdr, s2t_map[i].stringlen + 4); |
874 | if (!p) | |
3554116d | 875 | return nfserr_resource; |
ddd1ea56 | 876 | p = xdr_encode_opaque(p, s2t_map[i].string, |
3554116d | 877 | s2t_map[i].stringlen); |
3554116d | 878 | return 0; |
1da177e4 | 879 | } |
3554116d | 880 | WARN_ON_ONCE(1); |
f7ce5d28 | 881 | return nfserr_serverfault; |
1da177e4 | 882 | } |