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1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
22 | * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. | |
23 | */ | |
24 | ||
25 | #include <sys/zfs_context.h> | |
26 | #include <sys/dmu.h> | |
27 | #include <sys/avl.h> | |
28 | #include <sys/zap.h> | |
29 | #include <sys/refcount.h> | |
30 | #include <sys/nvpair.h> | |
31 | #ifdef _KERNEL | |
32 | #include <sys/kidmap.h> | |
33 | #include <sys/sid.h> | |
34 | #include <sys/zfs_vfsops.h> | |
35 | #include <sys/zfs_znode.h> | |
36 | #endif | |
37 | #include <sys/zfs_fuid.h> | |
38 | ||
39 | /* | |
40 | * FUID Domain table(s). | |
41 | * | |
42 | * The FUID table is stored as a packed nvlist of an array | |
43 | * of nvlists which contain an index, domain string and offset | |
44 | * | |
45 | * During file system initialization the nvlist(s) are read and | |
46 | * two AVL trees are created. One tree is keyed by the index number | |
47 | * and the other by the domain string. Nodes are never removed from | |
48 | * trees, but new entries may be added. If a new entry is added then | |
49 | * the zsb->z_fuid_dirty flag is set to true and the caller will then | |
50 | * be responsible for calling zfs_fuid_sync() to sync the changes to disk. | |
51 | * | |
52 | */ | |
53 | ||
54 | #define FUID_IDX "fuid_idx" | |
55 | #define FUID_DOMAIN "fuid_domain" | |
56 | #define FUID_OFFSET "fuid_offset" | |
57 | #define FUID_NVP_ARRAY "fuid_nvlist" | |
58 | ||
59 | typedef struct fuid_domain { | |
60 | avl_node_t f_domnode; | |
61 | avl_node_t f_idxnode; | |
62 | ksiddomain_t *f_ksid; | |
63 | uint64_t f_idx; | |
64 | } fuid_domain_t; | |
65 | ||
66 | static char *nulldomain = ""; | |
67 | ||
68 | /* | |
69 | * Compare two indexes. | |
70 | */ | |
71 | static int | |
72 | idx_compare(const void *arg1, const void *arg2) | |
73 | { | |
74 | const fuid_domain_t *node1 = arg1; | |
75 | const fuid_domain_t *node2 = arg2; | |
76 | ||
77 | if (node1->f_idx < node2->f_idx) | |
78 | return (-1); | |
79 | else if (node1->f_idx > node2->f_idx) | |
80 | return (1); | |
81 | return (0); | |
82 | } | |
83 | ||
84 | /* | |
85 | * Compare two domain strings. | |
86 | */ | |
87 | static int | |
88 | domain_compare(const void *arg1, const void *arg2) | |
89 | { | |
90 | const fuid_domain_t *node1 = arg1; | |
91 | const fuid_domain_t *node2 = arg2; | |
92 | int val; | |
93 | ||
94 | val = strcmp(node1->f_ksid->kd_name, node2->f_ksid->kd_name); | |
95 | if (val == 0) | |
96 | return (0); | |
97 | return (val > 0 ? 1 : -1); | |
98 | } | |
99 | ||
100 | void | |
101 | zfs_fuid_avl_tree_create(avl_tree_t *idx_tree, avl_tree_t *domain_tree) | |
102 | { | |
103 | avl_create(idx_tree, idx_compare, | |
104 | sizeof (fuid_domain_t), offsetof(fuid_domain_t, f_idxnode)); | |
105 | avl_create(domain_tree, domain_compare, | |
106 | sizeof (fuid_domain_t), offsetof(fuid_domain_t, f_domnode)); | |
107 | } | |
108 | ||
109 | /* | |
110 | * load initial fuid domain and idx trees. This function is used by | |
111 | * both the kernel and zdb. | |
112 | */ | |
113 | uint64_t | |
114 | zfs_fuid_table_load(objset_t *os, uint64_t fuid_obj, avl_tree_t *idx_tree, | |
115 | avl_tree_t *domain_tree) | |
116 | { | |
117 | dmu_buf_t *db; | |
118 | uint64_t fuid_size; | |
119 | ||
120 | ASSERT(fuid_obj != 0); | |
121 | VERIFY(0 == dmu_bonus_hold(os, fuid_obj, | |
122 | FTAG, &db)); | |
123 | fuid_size = *(uint64_t *)db->db_data; | |
124 | dmu_buf_rele(db, FTAG); | |
125 | ||
126 | if (fuid_size) { | |
127 | nvlist_t **fuidnvp; | |
128 | nvlist_t *nvp = NULL; | |
129 | uint_t count; | |
130 | char *packed; | |
131 | int i; | |
132 | ||
133 | packed = kmem_alloc(fuid_size, KM_SLEEP); | |
134 | VERIFY(dmu_read(os, fuid_obj, 0, | |
135 | fuid_size, packed, DMU_READ_PREFETCH) == 0); | |
136 | VERIFY(nvlist_unpack(packed, fuid_size, | |
137 | &nvp, 0) == 0); | |
138 | VERIFY(nvlist_lookup_nvlist_array(nvp, FUID_NVP_ARRAY, | |
139 | &fuidnvp, &count) == 0); | |
140 | ||
141 | for (i = 0; i != count; i++) { | |
142 | fuid_domain_t *domnode; | |
143 | char *domain; | |
144 | uint64_t idx; | |
145 | ||
146 | VERIFY(nvlist_lookup_string(fuidnvp[i], FUID_DOMAIN, | |
147 | &domain) == 0); | |
148 | VERIFY(nvlist_lookup_uint64(fuidnvp[i], FUID_IDX, | |
149 | &idx) == 0); | |
150 | ||
151 | domnode = kmem_alloc(sizeof (fuid_domain_t), KM_SLEEP); | |
152 | ||
153 | domnode->f_idx = idx; | |
154 | domnode->f_ksid = ksid_lookupdomain(domain); | |
155 | avl_add(idx_tree, domnode); | |
156 | avl_add(domain_tree, domnode); | |
157 | } | |
158 | nvlist_free(nvp); | |
159 | kmem_free(packed, fuid_size); | |
160 | } | |
161 | return (fuid_size); | |
162 | } | |
163 | ||
164 | void | |
165 | zfs_fuid_table_destroy(avl_tree_t *idx_tree, avl_tree_t *domain_tree) | |
166 | { | |
167 | fuid_domain_t *domnode; | |
168 | void *cookie; | |
169 | ||
170 | cookie = NULL; | |
171 | while ((domnode = avl_destroy_nodes(domain_tree, &cookie))) | |
172 | ksiddomain_rele(domnode->f_ksid); | |
173 | ||
174 | avl_destroy(domain_tree); | |
175 | cookie = NULL; | |
176 | while ((domnode = avl_destroy_nodes(idx_tree, &cookie))) | |
177 | kmem_free(domnode, sizeof (fuid_domain_t)); | |
178 | avl_destroy(idx_tree); | |
179 | } | |
180 | ||
181 | char * | |
182 | zfs_fuid_idx_domain(avl_tree_t *idx_tree, uint32_t idx) | |
183 | { | |
184 | fuid_domain_t searchnode, *findnode; | |
185 | avl_index_t loc; | |
186 | ||
187 | searchnode.f_idx = idx; | |
188 | ||
189 | findnode = avl_find(idx_tree, &searchnode, &loc); | |
190 | ||
191 | return (findnode ? findnode->f_ksid->kd_name : nulldomain); | |
192 | } | |
193 | ||
194 | #ifdef _KERNEL | |
195 | /* | |
196 | * Load the fuid table(s) into memory. | |
197 | */ | |
198 | static void | |
199 | zfs_fuid_init(zfs_sb_t *zsb) | |
200 | { | |
201 | rw_enter(&zsb->z_fuid_lock, RW_WRITER); | |
202 | ||
203 | if (zsb->z_fuid_loaded) { | |
204 | rw_exit(&zsb->z_fuid_lock); | |
205 | return; | |
206 | } | |
207 | ||
208 | zfs_fuid_avl_tree_create(&zsb->z_fuid_idx, &zsb->z_fuid_domain); | |
209 | ||
210 | (void) zap_lookup(zsb->z_os, MASTER_NODE_OBJ, | |
211 | ZFS_FUID_TABLES, 8, 1, &zsb->z_fuid_obj); | |
212 | if (zsb->z_fuid_obj != 0) { | |
213 | zsb->z_fuid_size = zfs_fuid_table_load(zsb->z_os, | |
214 | zsb->z_fuid_obj, &zsb->z_fuid_idx, | |
215 | &zsb->z_fuid_domain); | |
216 | } | |
217 | ||
218 | zsb->z_fuid_loaded = B_TRUE; | |
219 | rw_exit(&zsb->z_fuid_lock); | |
220 | } | |
221 | ||
222 | /* | |
223 | * sync out AVL trees to persistent storage. | |
224 | */ | |
225 | void | |
226 | zfs_fuid_sync(zfs_sb_t *zsb, dmu_tx_t *tx) | |
227 | { | |
228 | nvlist_t *nvp; | |
229 | nvlist_t **fuids; | |
230 | size_t nvsize = 0; | |
231 | char *packed; | |
232 | dmu_buf_t *db; | |
233 | fuid_domain_t *domnode; | |
234 | int numnodes; | |
235 | int i; | |
236 | ||
237 | if (!zsb->z_fuid_dirty) { | |
238 | return; | |
239 | } | |
240 | ||
241 | rw_enter(&zsb->z_fuid_lock, RW_WRITER); | |
242 | ||
243 | /* | |
244 | * First see if table needs to be created? | |
245 | */ | |
246 | if (zsb->z_fuid_obj == 0) { | |
247 | zsb->z_fuid_obj = dmu_object_alloc(zsb->z_os, | |
248 | DMU_OT_FUID, 1 << 14, DMU_OT_FUID_SIZE, | |
249 | sizeof (uint64_t), tx); | |
250 | VERIFY(zap_add(zsb->z_os, MASTER_NODE_OBJ, | |
251 | ZFS_FUID_TABLES, sizeof (uint64_t), 1, | |
252 | &zsb->z_fuid_obj, tx) == 0); | |
253 | } | |
254 | ||
255 | VERIFY(nvlist_alloc(&nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); | |
256 | ||
257 | numnodes = avl_numnodes(&zsb->z_fuid_idx); | |
258 | fuids = kmem_alloc(numnodes * sizeof (void *), KM_SLEEP); | |
259 | for (i = 0, domnode = avl_first(&zsb->z_fuid_domain); domnode; i++, | |
260 | domnode = AVL_NEXT(&zsb->z_fuid_domain, domnode)) { | |
261 | VERIFY(nvlist_alloc(&fuids[i], NV_UNIQUE_NAME, KM_SLEEP) == 0); | |
262 | VERIFY(nvlist_add_uint64(fuids[i], FUID_IDX, | |
263 | domnode->f_idx) == 0); | |
264 | VERIFY(nvlist_add_uint64(fuids[i], FUID_OFFSET, 0) == 0); | |
265 | VERIFY(nvlist_add_string(fuids[i], FUID_DOMAIN, | |
266 | domnode->f_ksid->kd_name) == 0); | |
267 | } | |
268 | VERIFY(nvlist_add_nvlist_array(nvp, FUID_NVP_ARRAY, | |
269 | fuids, numnodes) == 0); | |
270 | for (i = 0; i != numnodes; i++) | |
271 | nvlist_free(fuids[i]); | |
272 | kmem_free(fuids, numnodes * sizeof (void *)); | |
273 | VERIFY(nvlist_size(nvp, &nvsize, NV_ENCODE_XDR) == 0); | |
274 | packed = kmem_alloc(nvsize, KM_SLEEP); | |
275 | VERIFY(nvlist_pack(nvp, &packed, &nvsize, | |
276 | NV_ENCODE_XDR, KM_SLEEP) == 0); | |
277 | nvlist_free(nvp); | |
278 | zsb->z_fuid_size = nvsize; | |
279 | dmu_write(zsb->z_os, zsb->z_fuid_obj, 0, zsb->z_fuid_size, packed, tx); | |
280 | kmem_free(packed, zsb->z_fuid_size); | |
281 | VERIFY(0 == dmu_bonus_hold(zsb->z_os, zsb->z_fuid_obj, | |
282 | FTAG, &db)); | |
283 | dmu_buf_will_dirty(db, tx); | |
284 | *(uint64_t *)db->db_data = zsb->z_fuid_size; | |
285 | dmu_buf_rele(db, FTAG); | |
286 | ||
287 | zsb->z_fuid_dirty = B_FALSE; | |
288 | rw_exit(&zsb->z_fuid_lock); | |
289 | } | |
290 | ||
291 | /* | |
292 | * Query domain table for a given domain. | |
293 | * | |
294 | * If domain isn't found and addok is set, it is added to AVL trees and | |
295 | * the zsb->z_fuid_dirty flag will be set to TRUE. It will then be | |
296 | * necessary for the caller or another thread to detect the dirty table | |
297 | * and sync out the changes. | |
298 | */ | |
299 | int | |
300 | zfs_fuid_find_by_domain(zfs_sb_t *zsb, const char *domain, | |
301 | char **retdomain, boolean_t addok) | |
302 | { | |
303 | fuid_domain_t searchnode, *findnode; | |
304 | avl_index_t loc; | |
305 | krw_t rw = RW_READER; | |
306 | ||
307 | /* | |
308 | * If the dummy "nobody" domain then return an index of 0 | |
309 | * to cause the created FUID to be a standard POSIX id | |
310 | * for the user nobody. | |
311 | */ | |
312 | if (domain[0] == '\0') { | |
313 | if (retdomain) | |
314 | *retdomain = nulldomain; | |
315 | return (0); | |
316 | } | |
317 | ||
318 | searchnode.f_ksid = ksid_lookupdomain(domain); | |
319 | if (retdomain) | |
320 | *retdomain = searchnode.f_ksid->kd_name; | |
321 | if (!zsb->z_fuid_loaded) | |
322 | zfs_fuid_init(zsb); | |
323 | ||
324 | retry: | |
325 | rw_enter(&zsb->z_fuid_lock, rw); | |
326 | findnode = avl_find(&zsb->z_fuid_domain, &searchnode, &loc); | |
327 | ||
328 | if (findnode) { | |
329 | rw_exit(&zsb->z_fuid_lock); | |
330 | ksiddomain_rele(searchnode.f_ksid); | |
331 | return (findnode->f_idx); | |
332 | } else if (addok) { | |
333 | fuid_domain_t *domnode; | |
334 | uint64_t retidx; | |
335 | ||
336 | if (rw == RW_READER && !rw_tryupgrade(&zsb->z_fuid_lock)) { | |
337 | rw_exit(&zsb->z_fuid_lock); | |
338 | rw = RW_WRITER; | |
339 | goto retry; | |
340 | } | |
341 | ||
342 | domnode = kmem_alloc(sizeof (fuid_domain_t), KM_SLEEP); | |
343 | domnode->f_ksid = searchnode.f_ksid; | |
344 | ||
345 | retidx = domnode->f_idx = avl_numnodes(&zsb->z_fuid_idx) + 1; | |
346 | ||
347 | avl_add(&zsb->z_fuid_domain, domnode); | |
348 | avl_add(&zsb->z_fuid_idx, domnode); | |
349 | zsb->z_fuid_dirty = B_TRUE; | |
350 | rw_exit(&zsb->z_fuid_lock); | |
351 | return (retidx); | |
352 | } else { | |
353 | rw_exit(&zsb->z_fuid_lock); | |
354 | return (-1); | |
355 | } | |
356 | } | |
357 | ||
358 | /* | |
359 | * Query domain table by index, returning domain string | |
360 | * | |
361 | * Returns a pointer from an avl node of the domain string. | |
362 | * | |
363 | */ | |
364 | const char * | |
365 | zfs_fuid_find_by_idx(zfs_sb_t *zsb, uint32_t idx) | |
366 | { | |
367 | char *domain; | |
368 | ||
369 | if (idx == 0 || !zsb->z_use_fuids) | |
370 | return (NULL); | |
371 | ||
372 | if (!zsb->z_fuid_loaded) | |
373 | zfs_fuid_init(zsb); | |
374 | ||
375 | rw_enter(&zsb->z_fuid_lock, RW_READER); | |
376 | ||
377 | if (zsb->z_fuid_obj || zsb->z_fuid_dirty) | |
378 | domain = zfs_fuid_idx_domain(&zsb->z_fuid_idx, idx); | |
379 | else | |
380 | domain = nulldomain; | |
381 | rw_exit(&zsb->z_fuid_lock); | |
382 | ||
383 | ASSERT(domain); | |
384 | return (domain); | |
385 | } | |
386 | ||
387 | void | |
388 | zfs_fuid_map_ids(znode_t *zp, cred_t *cr, uid_t *uidp, uid_t *gidp) | |
389 | { | |
390 | *uidp = zfs_fuid_map_id(ZTOZSB(zp), zp->z_uid, cr, ZFS_OWNER); | |
391 | *gidp = zfs_fuid_map_id(ZTOZSB(zp), zp->z_gid, cr, ZFS_GROUP); | |
392 | } | |
393 | ||
394 | uid_t | |
395 | zfs_fuid_map_id(zfs_sb_t *zsb, uint64_t fuid, | |
396 | cred_t *cr, zfs_fuid_type_t type) | |
397 | { | |
398 | #ifdef HAVE_KSID | |
399 | uint32_t index = FUID_INDEX(fuid); | |
400 | const char *domain; | |
401 | uid_t id; | |
402 | ||
403 | if (index == 0) | |
404 | return (fuid); | |
405 | ||
406 | domain = zfs_fuid_find_by_idx(zsb, index); | |
407 | ASSERT(domain != NULL); | |
408 | ||
409 | if (type == ZFS_OWNER || type == ZFS_ACE_USER) { | |
410 | (void) kidmap_getuidbysid(crgetzone(cr), domain, | |
411 | FUID_RID(fuid), &id); | |
412 | } else { | |
413 | (void) kidmap_getgidbysid(crgetzone(cr), domain, | |
414 | FUID_RID(fuid), &id); | |
415 | } | |
416 | return (id); | |
417 | #else | |
418 | /* | |
419 | * The Linux port only supports POSIX IDs, use the passed id. | |
420 | */ | |
421 | return (fuid); | |
422 | #endif /* HAVE_KSID */ | |
423 | } | |
424 | ||
425 | /* | |
426 | * Add a FUID node to the list of fuid's being created for this | |
427 | * ACL | |
428 | * | |
429 | * If ACL has multiple domains, then keep only one copy of each unique | |
430 | * domain. | |
431 | */ | |
432 | void | |
433 | zfs_fuid_node_add(zfs_fuid_info_t **fuidpp, const char *domain, uint32_t rid, | |
434 | uint64_t idx, uint64_t id, zfs_fuid_type_t type) | |
435 | { | |
436 | zfs_fuid_t *fuid; | |
437 | zfs_fuid_domain_t *fuid_domain; | |
438 | zfs_fuid_info_t *fuidp; | |
439 | uint64_t fuididx; | |
440 | boolean_t found = B_FALSE; | |
441 | ||
442 | if (*fuidpp == NULL) | |
443 | *fuidpp = zfs_fuid_info_alloc(); | |
444 | ||
445 | fuidp = *fuidpp; | |
446 | /* | |
447 | * First find fuid domain index in linked list | |
448 | * | |
449 | * If one isn't found then create an entry. | |
450 | */ | |
451 | ||
452 | for (fuididx = 1, fuid_domain = list_head(&fuidp->z_domains); | |
453 | fuid_domain; fuid_domain = list_next(&fuidp->z_domains, | |
454 | fuid_domain), fuididx++) { | |
455 | if (idx == fuid_domain->z_domidx) { | |
456 | found = B_TRUE; | |
457 | break; | |
458 | } | |
459 | } | |
460 | ||
461 | if (!found) { | |
462 | fuid_domain = kmem_alloc(sizeof (zfs_fuid_domain_t), KM_SLEEP); | |
463 | fuid_domain->z_domain = domain; | |
464 | fuid_domain->z_domidx = idx; | |
465 | list_insert_tail(&fuidp->z_domains, fuid_domain); | |
466 | fuidp->z_domain_str_sz += strlen(domain) + 1; | |
467 | fuidp->z_domain_cnt++; | |
468 | } | |
469 | ||
470 | if (type == ZFS_ACE_USER || type == ZFS_ACE_GROUP) { | |
471 | ||
472 | /* | |
473 | * Now allocate fuid entry and add it on the end of the list | |
474 | */ | |
475 | ||
476 | fuid = kmem_alloc(sizeof (zfs_fuid_t), KM_SLEEP); | |
477 | fuid->z_id = id; | |
478 | fuid->z_domidx = idx; | |
479 | fuid->z_logfuid = FUID_ENCODE(fuididx, rid); | |
480 | ||
481 | list_insert_tail(&fuidp->z_fuids, fuid); | |
482 | fuidp->z_fuid_cnt++; | |
483 | } else { | |
484 | if (type == ZFS_OWNER) | |
485 | fuidp->z_fuid_owner = FUID_ENCODE(fuididx, rid); | |
486 | else | |
487 | fuidp->z_fuid_group = FUID_ENCODE(fuididx, rid); | |
488 | } | |
489 | } | |
490 | ||
491 | #ifdef HAVE_KSID | |
492 | /* | |
493 | * Create a file system FUID, based on information in the users cred | |
494 | * | |
495 | * If cred contains KSID_OWNER then it should be used to determine | |
496 | * the uid otherwise cred's uid will be used. By default cred's gid | |
497 | * is used unless it's an ephemeral ID in which case KSID_GROUP will | |
498 | * be used if it exists. | |
499 | */ | |
500 | uint64_t | |
501 | zfs_fuid_create_cred(zfs_sb_t *zsb, zfs_fuid_type_t type, | |
502 | cred_t *cr, zfs_fuid_info_t **fuidp) | |
503 | { | |
504 | uint64_t idx; | |
505 | ksid_t *ksid; | |
506 | uint32_t rid; | |
507 | char *kdomain; | |
508 | const char *domain; | |
509 | uid_t id; | |
510 | ||
511 | VERIFY(type == ZFS_OWNER || type == ZFS_GROUP); | |
512 | ||
513 | ksid = crgetsid(cr, (type == ZFS_OWNER) ? KSID_OWNER : KSID_GROUP); | |
514 | ||
515 | if (!zsb->z_use_fuids || (ksid == NULL)) { | |
516 | id = (type == ZFS_OWNER) ? crgetuid(cr) : crgetgid(cr); | |
517 | ||
518 | if (IS_EPHEMERAL(id)) | |
519 | return ((type == ZFS_OWNER) ? UID_NOBODY : GID_NOBODY); | |
520 | ||
521 | return ((uint64_t)id); | |
522 | } | |
523 | ||
524 | /* | |
525 | * ksid is present and FUID is supported | |
526 | */ | |
527 | id = (type == ZFS_OWNER) ? ksid_getid(ksid) : crgetgid(cr); | |
528 | ||
529 | if (!IS_EPHEMERAL(id)) | |
530 | return ((uint64_t)id); | |
531 | ||
532 | if (type == ZFS_GROUP) | |
533 | id = ksid_getid(ksid); | |
534 | ||
535 | rid = ksid_getrid(ksid); | |
536 | domain = ksid_getdomain(ksid); | |
537 | ||
538 | idx = zfs_fuid_find_by_domain(zsb, domain, &kdomain, B_TRUE); | |
539 | ||
540 | zfs_fuid_node_add(fuidp, kdomain, rid, idx, id, type); | |
541 | ||
542 | return (FUID_ENCODE(idx, rid)); | |
543 | } | |
544 | #endif /* HAVE_KSID */ | |
545 | ||
546 | /* | |
547 | * Create a file system FUID for an ACL ace | |
548 | * or a chown/chgrp of the file. | |
549 | * This is similar to zfs_fuid_create_cred, except that | |
550 | * we can't find the domain + rid information in the | |
551 | * cred. Instead we have to query Winchester for the | |
552 | * domain and rid. | |
553 | * | |
554 | * During replay operations the domain+rid information is | |
555 | * found in the zfs_fuid_info_t that the replay code has | |
556 | * attached to the zsb of the file system. | |
557 | */ | |
558 | uint64_t | |
559 | zfs_fuid_create(zfs_sb_t *zsb, uint64_t id, cred_t *cr, | |
560 | zfs_fuid_type_t type, zfs_fuid_info_t **fuidpp) | |
561 | { | |
562 | #ifdef HAVE_KSID | |
563 | const char *domain; | |
564 | char *kdomain; | |
565 | uint32_t fuid_idx = FUID_INDEX(id); | |
566 | uint32_t rid; | |
567 | idmap_stat status; | |
568 | uint64_t idx = 0; | |
569 | zfs_fuid_t *zfuid = NULL; | |
570 | zfs_fuid_info_t *fuidp = NULL; | |
571 | ||
572 | /* | |
573 | * If POSIX ID, or entry is already a FUID then | |
574 | * just return the id | |
575 | * | |
576 | * We may also be handed an already FUID'ized id via | |
577 | * chmod. | |
578 | */ | |
579 | ||
580 | if (!zsb->z_use_fuids || !IS_EPHEMERAL(id) || fuid_idx != 0) | |
581 | return (id); | |
582 | ||
583 | if (zsb->z_replay) { | |
584 | fuidp = zsb->z_fuid_replay; | |
585 | ||
586 | /* | |
587 | * If we are passed an ephemeral id, but no | |
588 | * fuid_info was logged then return NOBODY. | |
589 | * This is most likely a result of idmap service | |
590 | * not being available. | |
591 | */ | |
592 | if (fuidp == NULL) | |
593 | return (UID_NOBODY); | |
594 | ||
595 | VERIFY3U(type, >=, ZFS_OWNER); | |
596 | VERIFY3U(type, <=, ZFS_ACE_GROUP); | |
597 | ||
598 | switch (type) { | |
599 | case ZFS_ACE_USER: | |
600 | case ZFS_ACE_GROUP: | |
601 | zfuid = list_head(&fuidp->z_fuids); | |
602 | rid = FUID_RID(zfuid->z_logfuid); | |
603 | idx = FUID_INDEX(zfuid->z_logfuid); | |
604 | break; | |
605 | case ZFS_OWNER: | |
606 | rid = FUID_RID(fuidp->z_fuid_owner); | |
607 | idx = FUID_INDEX(fuidp->z_fuid_owner); | |
608 | break; | |
609 | case ZFS_GROUP: | |
610 | rid = FUID_RID(fuidp->z_fuid_group); | |
611 | idx = FUID_INDEX(fuidp->z_fuid_group); | |
612 | break; | |
613 | }; | |
614 | domain = fuidp->z_domain_table[idx - 1]; | |
615 | } else { | |
616 | if (type == ZFS_OWNER || type == ZFS_ACE_USER) | |
617 | status = kidmap_getsidbyuid(crgetzone(cr), id, | |
618 | &domain, &rid); | |
619 | else | |
620 | status = kidmap_getsidbygid(crgetzone(cr), id, | |
621 | &domain, &rid); | |
622 | ||
623 | if (status != 0) { | |
624 | /* | |
625 | * When returning nobody we will need to | |
626 | * make a dummy fuid table entry for logging | |
627 | * purposes. | |
628 | */ | |
629 | rid = UID_NOBODY; | |
630 | domain = nulldomain; | |
631 | } | |
632 | } | |
633 | ||
634 | idx = zfs_fuid_find_by_domain(zsb, domain, &kdomain, B_TRUE); | |
635 | ||
636 | if (!zsb->z_replay) | |
637 | zfs_fuid_node_add(fuidpp, kdomain, | |
638 | rid, idx, id, type); | |
639 | else if (zfuid != NULL) { | |
640 | list_remove(&fuidp->z_fuids, zfuid); | |
641 | kmem_free(zfuid, sizeof (zfs_fuid_t)); | |
642 | } | |
643 | return (FUID_ENCODE(idx, rid)); | |
644 | #else | |
645 | /* | |
646 | * The Linux port only supports POSIX IDs, use the passed id. | |
647 | */ | |
648 | return (id); | |
649 | #endif | |
650 | } | |
651 | ||
652 | void | |
653 | zfs_fuid_destroy(zfs_sb_t *zsb) | |
654 | { | |
655 | rw_enter(&zsb->z_fuid_lock, RW_WRITER); | |
656 | if (!zsb->z_fuid_loaded) { | |
657 | rw_exit(&zsb->z_fuid_lock); | |
658 | return; | |
659 | } | |
660 | zfs_fuid_table_destroy(&zsb->z_fuid_idx, &zsb->z_fuid_domain); | |
661 | rw_exit(&zsb->z_fuid_lock); | |
662 | } | |
663 | ||
664 | /* | |
665 | * Allocate zfs_fuid_info for tracking FUIDs created during | |
666 | * zfs_mknode, VOP_SETATTR() or VOP_SETSECATTR() | |
667 | */ | |
668 | zfs_fuid_info_t * | |
669 | zfs_fuid_info_alloc(void) | |
670 | { | |
671 | zfs_fuid_info_t *fuidp; | |
672 | ||
673 | fuidp = kmem_zalloc(sizeof (zfs_fuid_info_t), KM_SLEEP); | |
674 | list_create(&fuidp->z_domains, sizeof (zfs_fuid_domain_t), | |
675 | offsetof(zfs_fuid_domain_t, z_next)); | |
676 | list_create(&fuidp->z_fuids, sizeof (zfs_fuid_t), | |
677 | offsetof(zfs_fuid_t, z_next)); | |
678 | return (fuidp); | |
679 | } | |
680 | ||
681 | /* | |
682 | * Release all memory associated with zfs_fuid_info_t | |
683 | */ | |
684 | void | |
685 | zfs_fuid_info_free(zfs_fuid_info_t *fuidp) | |
686 | { | |
687 | zfs_fuid_t *zfuid; | |
688 | zfs_fuid_domain_t *zdomain; | |
689 | ||
690 | while ((zfuid = list_head(&fuidp->z_fuids)) != NULL) { | |
691 | list_remove(&fuidp->z_fuids, zfuid); | |
692 | kmem_free(zfuid, sizeof (zfs_fuid_t)); | |
693 | } | |
694 | ||
695 | if (fuidp->z_domain_table != NULL) | |
696 | kmem_free(fuidp->z_domain_table, | |
697 | (sizeof (char **)) * fuidp->z_domain_cnt); | |
698 | ||
699 | while ((zdomain = list_head(&fuidp->z_domains)) != NULL) { | |
700 | list_remove(&fuidp->z_domains, zdomain); | |
701 | kmem_free(zdomain, sizeof (zfs_fuid_domain_t)); | |
702 | } | |
703 | ||
704 | kmem_free(fuidp, sizeof (zfs_fuid_info_t)); | |
705 | } | |
706 | ||
707 | /* | |
708 | * Check to see if id is a groupmember. If cred | |
709 | * has ksid info then sidlist is checked first | |
710 | * and if still not found then POSIX groups are checked | |
711 | * | |
712 | * Will use a straight FUID compare when possible. | |
713 | */ | |
714 | boolean_t | |
715 | zfs_groupmember(zfs_sb_t *zsb, uint64_t id, cred_t *cr) | |
716 | { | |
717 | #ifdef HAVE_KSID | |
718 | ksid_t *ksid = crgetsid(cr, KSID_GROUP); | |
719 | ksidlist_t *ksidlist = crgetsidlist(cr); | |
720 | uid_t gid; | |
721 | ||
722 | if (ksid && ksidlist) { | |
723 | int i; | |
724 | ksid_t *ksid_groups; | |
725 | uint32_t idx = FUID_INDEX(id); | |
726 | uint32_t rid = FUID_RID(id); | |
727 | ||
728 | ksid_groups = ksidlist->ksl_sids; | |
729 | ||
730 | for (i = 0; i != ksidlist->ksl_nsid; i++) { | |
731 | if (idx == 0) { | |
732 | if (id != IDMAP_WK_CREATOR_GROUP_GID && | |
733 | id == ksid_groups[i].ks_id) { | |
734 | return (B_TRUE); | |
735 | } | |
736 | } else { | |
737 | const char *domain; | |
738 | ||
739 | domain = zfs_fuid_find_by_idx(zsb, idx); | |
740 | ASSERT(domain != NULL); | |
741 | ||
742 | if (strcmp(domain, | |
743 | IDMAP_WK_CREATOR_SID_AUTHORITY) == 0) | |
744 | return (B_FALSE); | |
745 | ||
746 | if ((strcmp(domain, | |
747 | ksid_groups[i].ks_domain->kd_name) == 0) && | |
748 | rid == ksid_groups[i].ks_rid) | |
749 | return (B_TRUE); | |
750 | } | |
751 | } | |
752 | } | |
753 | ||
754 | /* | |
755 | * Not found in ksidlist, check posix groups | |
756 | */ | |
757 | gid = zfs_fuid_map_id(zsb, id, cr, ZFS_GROUP); | |
758 | return (groupmember(gid, cr)); | |
759 | #else | |
760 | return (B_TRUE); | |
761 | #endif | |
762 | } | |
763 | ||
764 | void | |
765 | zfs_fuid_txhold(zfs_sb_t *zsb, dmu_tx_t *tx) | |
766 | { | |
767 | if (zsb->z_fuid_obj == 0) { | |
768 | dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); | |
769 | dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, | |
770 | FUID_SIZE_ESTIMATE(zsb)); | |
771 | dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL); | |
772 | } else { | |
773 | dmu_tx_hold_bonus(tx, zsb->z_fuid_obj); | |
774 | dmu_tx_hold_write(tx, zsb->z_fuid_obj, 0, | |
775 | FUID_SIZE_ESTIMATE(zsb)); | |
776 | } | |
777 | } | |
778 | #endif |