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Commit | Line | Data |
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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 = { | |
bc09d141 | 41 | 1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} }; |
d0d66c44 | 42 | |
3514de3f SF |
43 | /* S-1-22-1 Unmapped Unix users */ |
44 | static const struct cifs_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22}, | |
45 | {cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; | |
46 | ||
47 | /* S-1-22-2 Unmapped Unix groups */ | |
48 | static const struct cifs_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22}, | |
49 | {cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; | |
50 | ||
51 | /* | |
cba22b1c | 52 | * See https://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx |
3514de3f SF |
53 | */ |
54 | ||
55 | /* S-1-5-88 MS NFS and Apple style UID/GID/mode */ | |
56 | ||
57 | /* S-1-5-88-1 Unix uid */ | |
58 | static const struct cifs_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5}, | |
59 | {cpu_to_le32(88), | |
60 | cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; | |
61 | ||
62 | /* S-1-5-88-2 Unix gid */ | |
63 | static const struct cifs_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5}, | |
64 | {cpu_to_le32(88), | |
65 | cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; | |
66 | ||
67 | /* S-1-5-88-3 Unix mode */ | |
68 | static const struct cifs_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5}, | |
69 | {cpu_to_le32(88), | |
70 | cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; | |
71 | ||
b1a6dc21 | 72 | static const struct cred *root_cred; |
9409ae58 | 73 | |
4d79dba0 | 74 | static int |
cf7f601c | 75 | cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep) |
4d79dba0 SP |
76 | { |
77 | char *payload; | |
78 | ||
41a9f1f6 JL |
79 | /* |
80 | * If the payload is less than or equal to the size of a pointer, then | |
81 | * an allocation here is wasteful. Just copy the data directly to the | |
82 | * payload.value union member instead. | |
83 | * | |
84 | * With this however, you must check the datalen before trying to | |
85 | * dereference payload.data! | |
86 | */ | |
1f630680 | 87 | if (prep->datalen <= sizeof(key->payload)) { |
146aa8b1 DH |
88 | key->payload.data[0] = NULL; |
89 | memcpy(&key->payload, prep->data, prep->datalen); | |
90 | } else { | |
91 | payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL); | |
92 | if (!payload) | |
93 | return -ENOMEM; | |
94 | key->payload.data[0] = payload; | |
41a9f1f6 | 95 | } |
4d79dba0 | 96 | |
cf7f601c | 97 | key->datalen = prep->datalen; |
4d79dba0 SP |
98 | return 0; |
99 | } | |
100 | ||
101 | static inline void | |
102 | cifs_idmap_key_destroy(struct key *key) | |
103 | { | |
1f630680 | 104 | if (key->datalen > sizeof(key->payload)) |
146aa8b1 | 105 | kfree(key->payload.data[0]); |
4d79dba0 SP |
106 | } |
107 | ||
b1a6dc21 | 108 | static struct key_type cifs_idmap_key_type = { |
c4aca0c0 | 109 | .name = "cifs.idmap", |
4d79dba0 SP |
110 | .instantiate = cifs_idmap_key_instantiate, |
111 | .destroy = cifs_idmap_key_destroy, | |
112 | .describe = user_describe, | |
4d79dba0 SP |
113 | }; |
114 | ||
faa65f07 JL |
115 | static char * |
116 | sid_to_key_str(struct cifs_sid *sidptr, unsigned int type) | |
9409ae58 | 117 | { |
faa65f07 | 118 | int i, len; |
ee13b2ba | 119 | unsigned int saval; |
faa65f07 | 120 | char *sidstr, *strptr; |
193cdd8a | 121 | unsigned long long id_auth_val; |
9409ae58 | 122 | |
faa65f07 JL |
123 | /* 3 bytes for prefix */ |
124 | sidstr = kmalloc(3 + SID_STRING_BASE_SIZE + | |
125 | (SID_STRING_SUBAUTH_SIZE * sidptr->num_subauth), | |
126 | GFP_KERNEL); | |
127 | if (!sidstr) | |
128 | return sidstr; | |
9409ae58 | 129 | |
faa65f07 JL |
130 | strptr = sidstr; |
131 | len = sprintf(strptr, "%cs:S-%hhu", type == SIDOWNER ? 'o' : 'g', | |
132 | sidptr->revision); | |
133 | strptr += len; | |
9409ae58 | 134 | |
193cdd8a JL |
135 | /* The authority field is a single 48-bit number */ |
136 | id_auth_val = (unsigned long long)sidptr->authority[5]; | |
137 | id_auth_val |= (unsigned long long)sidptr->authority[4] << 8; | |
138 | id_auth_val |= (unsigned long long)sidptr->authority[3] << 16; | |
139 | id_auth_val |= (unsigned long long)sidptr->authority[2] << 24; | |
140 | id_auth_val |= (unsigned long long)sidptr->authority[1] << 32; | |
141 | id_auth_val |= (unsigned long long)sidptr->authority[0] << 48; | |
142 | ||
143 | /* | |
144 | * MS-DTYP states that if the authority is >= 2^32, then it should be | |
145 | * expressed as a hex value. | |
146 | */ | |
147 | if (id_auth_val <= UINT_MAX) | |
148 | len = sprintf(strptr, "-%llu", id_auth_val); | |
149 | else | |
150 | len = sprintf(strptr, "-0x%llx", id_auth_val); | |
151 | ||
152 | strptr += len; | |
9409ae58 SP |
153 | |
154 | for (i = 0; i < sidptr->num_subauth; ++i) { | |
155 | saval = le32_to_cpu(sidptr->sub_auth[i]); | |
faa65f07 JL |
156 | len = sprintf(strptr, "-%u", saval); |
157 | strptr += len; | |
9409ae58 | 158 | } |
faa65f07 JL |
159 | |
160 | return sidstr; | |
9409ae58 SP |
161 | } |
162 | ||
436bb435 JL |
163 | /* |
164 | * if the two SIDs (roughly equivalent to a UUID for a user or group) are | |
165 | * the same returns zero, if they do not match returns non-zero. | |
166 | */ | |
167 | static int | |
168 | compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) | |
169 | { | |
170 | int i; | |
171 | int num_subauth, num_sat, num_saw; | |
172 | ||
173 | if ((!ctsid) || (!cwsid)) | |
174 | return 1; | |
175 | ||
176 | /* compare the revision */ | |
177 | if (ctsid->revision != cwsid->revision) { | |
178 | if (ctsid->revision > cwsid->revision) | |
179 | return 1; | |
180 | else | |
181 | return -1; | |
182 | } | |
183 | ||
184 | /* compare all of the six auth values */ | |
185 | for (i = 0; i < NUM_AUTHS; ++i) { | |
186 | if (ctsid->authority[i] != cwsid->authority[i]) { | |
187 | if (ctsid->authority[i] > cwsid->authority[i]) | |
188 | return 1; | |
189 | else | |
190 | return -1; | |
191 | } | |
192 | } | |
193 | ||
194 | /* compare all of the subauth values if any */ | |
195 | num_sat = ctsid->num_subauth; | |
196 | num_saw = cwsid->num_subauth; | |
197 | num_subauth = num_sat < num_saw ? num_sat : num_saw; | |
198 | if (num_subauth) { | |
199 | for (i = 0; i < num_subauth; ++i) { | |
200 | if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { | |
201 | if (le32_to_cpu(ctsid->sub_auth[i]) > | |
202 | le32_to_cpu(cwsid->sub_auth[i])) | |
203 | return 1; | |
204 | else | |
205 | return -1; | |
206 | } | |
207 | } | |
208 | } | |
209 | ||
210 | return 0; /* sids compare/match */ | |
211 | } | |
212 | ||
3514de3f SF |
213 | static bool |
214 | is_well_known_sid(const struct cifs_sid *psid, uint32_t *puid, bool is_group) | |
215 | { | |
216 | int i; | |
217 | int num_subauth; | |
218 | const struct cifs_sid *pwell_known_sid; | |
219 | ||
220 | if (!psid || (puid == NULL)) | |
221 | return false; | |
222 | ||
223 | num_subauth = psid->num_subauth; | |
224 | ||
225 | /* check if Mac (or Windows NFS) vs. Samba format for Unix owner SID */ | |
226 | if (num_subauth == 2) { | |
227 | if (is_group) | |
228 | pwell_known_sid = &sid_unix_groups; | |
229 | else | |
230 | pwell_known_sid = &sid_unix_users; | |
231 | } else if (num_subauth == 3) { | |
232 | if (is_group) | |
233 | pwell_known_sid = &sid_unix_NFS_groups; | |
234 | else | |
235 | pwell_known_sid = &sid_unix_NFS_users; | |
236 | } else | |
237 | return false; | |
238 | ||
239 | /* compare the revision */ | |
240 | if (psid->revision != pwell_known_sid->revision) | |
241 | return false; | |
242 | ||
243 | /* compare all of the six auth values */ | |
244 | for (i = 0; i < NUM_AUTHS; ++i) { | |
245 | if (psid->authority[i] != pwell_known_sid->authority[i]) { | |
246 | cifs_dbg(FYI, "auth %d did not match\n", i); | |
247 | return false; | |
248 | } | |
249 | } | |
250 | ||
251 | if (num_subauth == 2) { | |
252 | if (psid->sub_auth[0] != pwell_known_sid->sub_auth[0]) | |
253 | return false; | |
254 | ||
255 | *puid = le32_to_cpu(psid->sub_auth[1]); | |
256 | } else /* 3 subauths, ie Windows/Mac style */ { | |
257 | *puid = le32_to_cpu(psid->sub_auth[0]); | |
258 | if ((psid->sub_auth[0] != pwell_known_sid->sub_auth[0]) || | |
259 | (psid->sub_auth[1] != pwell_known_sid->sub_auth[1])) | |
260 | return false; | |
261 | ||
262 | *puid = le32_to_cpu(psid->sub_auth[2]); | |
263 | } | |
264 | ||
265 | cifs_dbg(FYI, "Unix UID %d returned from SID\n", *puid); | |
266 | return true; /* well known sid found, uid returned */ | |
267 | } | |
268 | ||
36960e44 JL |
269 | static void |
270 | cifs_copy_sid(struct cifs_sid *dst, const struct cifs_sid *src) | |
271 | { | |
36f87ee7 JL |
272 | int i; |
273 | ||
274 | dst->revision = src->revision; | |
30c9d6cc | 275 | dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES); |
36f87ee7 JL |
276 | for (i = 0; i < NUM_AUTHS; ++i) |
277 | dst->authority[i] = src->authority[i]; | |
278 | for (i = 0; i < dst->num_subauth; ++i) | |
279 | dst->sub_auth[i] = src->sub_auth[i]; | |
36960e44 JL |
280 | } |
281 | ||
9409ae58 | 282 | static int |
faa65f07 | 283 | id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) |
9409ae58 | 284 | { |
faa65f07 | 285 | int rc; |
21fed0d5 | 286 | struct key *sidkey; |
2ae03025 JL |
287 | struct cifs_sid *ksid; |
288 | unsigned int ksid_size; | |
faa65f07 | 289 | char desc[3 + 10 + 1]; /* 3 byte prefix + 10 bytes for value + NULL */ |
21fed0d5 | 290 | const struct cred *saved_cred; |
21fed0d5 | 291 | |
faa65f07 JL |
292 | rc = snprintf(desc, sizeof(desc), "%ci:%u", |
293 | sidtype == SIDOWNER ? 'o' : 'g', cid); | |
294 | if (rc >= sizeof(desc)) | |
295 | return -EINVAL; | |
21fed0d5 | 296 | |
faa65f07 JL |
297 | rc = 0; |
298 | saved_cred = override_creds(root_cred); | |
028db3e2 | 299 | sidkey = request_key(&cifs_idmap_key_type, desc, ""); |
faa65f07 | 300 | if (IS_ERR(sidkey)) { |
21fed0d5 | 301 | rc = -EINVAL; |
f96637be JP |
302 | cifs_dbg(FYI, "%s: Can't map %cid %u to a SID\n", |
303 | __func__, sidtype == SIDOWNER ? 'u' : 'g', cid); | |
faa65f07 JL |
304 | goto out_revert_creds; |
305 | } else if (sidkey->datalen < CIFS_SID_BASE_SIZE) { | |
306 | rc = -EIO; | |
f96637be JP |
307 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
308 | __func__, sidkey->datalen); | |
2ae03025 | 309 | goto invalidate_key; |
21fed0d5 | 310 | } |
2ae03025 | 311 | |
1f630680 JL |
312 | /* |
313 | * A sid is usually too large to be embedded in payload.value, but if | |
314 | * there are no subauthorities and the host has 8-byte pointers, then | |
315 | * it could be. | |
316 | */ | |
317 | ksid = sidkey->datalen <= sizeof(sidkey->payload) ? | |
146aa8b1 DH |
318 | (struct cifs_sid *)&sidkey->payload : |
319 | (struct cifs_sid *)sidkey->payload.data[0]; | |
1f630680 | 320 | |
2ae03025 JL |
321 | ksid_size = CIFS_SID_BASE_SIZE + (ksid->num_subauth * sizeof(__le32)); |
322 | if (ksid_size > sidkey->datalen) { | |
323 | rc = -EIO; | |
f96637be JP |
324 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu, ksid_size=%u)\n", |
325 | __func__, sidkey->datalen, ksid_size); | |
2ae03025 JL |
326 | goto invalidate_key; |
327 | } | |
1f630680 | 328 | |
2ae03025 | 329 | cifs_copy_sid(ssid, ksid); |
faa65f07 JL |
330 | out_key_put: |
331 | key_put(sidkey); | |
332 | out_revert_creds: | |
333 | revert_creds(saved_cred); | |
21fed0d5 | 334 | return rc; |
2ae03025 JL |
335 | |
336 | invalidate_key: | |
337 | key_invalidate(sidkey); | |
338 | goto out_key_put; | |
21fed0d5 SP |
339 | } |
340 | ||
9934430e | 341 | int |
9409ae58 SP |
342 | sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid, |
343 | struct cifs_fattr *fattr, uint sidtype) | |
344 | { | |
f2d67931 | 345 | int rc = 0; |
faa65f07 JL |
346 | struct key *sidkey; |
347 | char *sidstr; | |
9409ae58 | 348 | const struct cred *saved_cred; |
8abf2775 EB |
349 | kuid_t fuid = cifs_sb->mnt_uid; |
350 | kgid_t fgid = cifs_sb->mnt_gid; | |
9409ae58 SP |
351 | |
352 | /* | |
faa65f07 JL |
353 | * If we have too many subauthorities, then something is really wrong. |
354 | * Just return an error. | |
9409ae58 | 355 | */ |
faa65f07 | 356 | if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) { |
f96637be JP |
357 | cifs_dbg(FYI, "%s: %u subauthorities is too many!\n", |
358 | __func__, psid->num_subauth); | |
faa65f07 | 359 | return -EIO; |
9409ae58 SP |
360 | } |
361 | ||
9934430e SF |
362 | if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) || |
363 | (cifs_sb_master_tcon(cifs_sb)->posix_extensions)) { | |
3514de3f SF |
364 | uint32_t unix_id; |
365 | bool is_group; | |
366 | ||
367 | if (sidtype != SIDOWNER) | |
368 | is_group = true; | |
369 | else | |
370 | is_group = false; | |
371 | ||
372 | if (is_well_known_sid(psid, &unix_id, is_group) == false) | |
373 | goto try_upcall_to_get_id; | |
374 | ||
375 | if (is_group) { | |
376 | kgid_t gid; | |
377 | gid_t id; | |
378 | ||
379 | id = (gid_t)unix_id; | |
380 | gid = make_kgid(&init_user_ns, id); | |
381 | if (gid_valid(gid)) { | |
382 | fgid = gid; | |
383 | goto got_valid_id; | |
384 | } | |
385 | } else { | |
386 | kuid_t uid; | |
387 | uid_t id; | |
388 | ||
389 | id = (uid_t)unix_id; | |
390 | uid = make_kuid(&init_user_ns, id); | |
391 | if (uid_valid(uid)) { | |
392 | fuid = uid; | |
393 | goto got_valid_id; | |
394 | } | |
395 | } | |
396 | /* If unable to find uid/gid easily from SID try via upcall */ | |
397 | } | |
398 | ||
399 | try_upcall_to_get_id: | |
faa65f07 JL |
400 | sidstr = sid_to_key_str(psid, sidtype); |
401 | if (!sidstr) | |
402 | return -ENOMEM; | |
403 | ||
404 | saved_cred = override_creds(root_cred); | |
028db3e2 | 405 | sidkey = request_key(&cifs_idmap_key_type, sidstr, ""); |
faa65f07 JL |
406 | if (IS_ERR(sidkey)) { |
407 | rc = -EINVAL; | |
f96637be JP |
408 | cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n", |
409 | __func__, sidstr, sidtype == SIDOWNER ? 'u' : 'g'); | |
faa65f07 JL |
410 | goto out_revert_creds; |
411 | } | |
412 | ||
413 | /* | |
414 | * FIXME: Here we assume that uid_t and gid_t are same size. It's | |
415 | * probably a safe assumption but might be better to check based on | |
416 | * sidtype. | |
417 | */ | |
355958f2 | 418 | BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t)); |
41a9f1f6 | 419 | if (sidkey->datalen != sizeof(uid_t)) { |
faa65f07 | 420 | rc = -EIO; |
f96637be JP |
421 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
422 | __func__, sidkey->datalen); | |
2ae03025 | 423 | key_invalidate(sidkey); |
faa65f07 | 424 | goto out_key_put; |
9409ae58 SP |
425 | } |
426 | ||
8abf2775 EB |
427 | if (sidtype == SIDOWNER) { |
428 | kuid_t uid; | |
429 | uid_t id; | |
146aa8b1 | 430 | memcpy(&id, &sidkey->payload.data[0], sizeof(uid_t)); |
8abf2775 EB |
431 | uid = make_kuid(&init_user_ns, id); |
432 | if (uid_valid(uid)) | |
433 | fuid = uid; | |
434 | } else { | |
435 | kgid_t gid; | |
436 | gid_t id; | |
146aa8b1 | 437 | memcpy(&id, &sidkey->payload.data[0], sizeof(gid_t)); |
8abf2775 EB |
438 | gid = make_kgid(&init_user_ns, id); |
439 | if (gid_valid(gid)) | |
440 | fgid = gid; | |
441 | } | |
faa65f07 JL |
442 | |
443 | out_key_put: | |
444 | key_put(sidkey); | |
445 | out_revert_creds: | |
446 | revert_creds(saved_cred); | |
447 | kfree(sidstr); | |
9409ae58 | 448 | |
faa65f07 JL |
449 | /* |
450 | * Note that we return 0 here unconditionally. If the mapping | |
451 | * fails then we just fall back to using the mnt_uid/mnt_gid. | |
452 | */ | |
3514de3f | 453 | got_valid_id: |
f2d67931 | 454 | rc = 0; |
faa65f07 JL |
455 | if (sidtype == SIDOWNER) |
456 | fattr->cf_uid = fuid; | |
457 | else | |
458 | fattr->cf_gid = fgid; | |
f2d67931 | 459 | return rc; |
9409ae58 SP |
460 | } |
461 | ||
4d79dba0 SP |
462 | int |
463 | init_cifs_idmap(void) | |
464 | { | |
465 | struct cred *cred; | |
466 | struct key *keyring; | |
467 | int ret; | |
468 | ||
f96637be JP |
469 | cifs_dbg(FYI, "Registering the %s key type\n", |
470 | cifs_idmap_key_type.name); | |
4d79dba0 SP |
471 | |
472 | /* create an override credential set with a special thread keyring in | |
473 | * which requests are cached | |
474 | * | |
475 | * this is used to prevent malicious redirections from being installed | |
476 | * with add_key(). | |
477 | */ | |
478 | cred = prepare_kernel_cred(NULL); | |
479 | if (!cred) | |
480 | return -ENOMEM; | |
481 | ||
8e3028b9 EB |
482 | keyring = keyring_alloc(".cifs_idmap", |
483 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, | |
028db3e2 LT |
484 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | |
485 | KEY_USR_VIEW | KEY_USR_READ, | |
5ac7eace | 486 | KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); |
4d79dba0 SP |
487 | if (IS_ERR(keyring)) { |
488 | ret = PTR_ERR(keyring); | |
489 | goto failed_put_cred; | |
490 | } | |
491 | ||
4d79dba0 SP |
492 | ret = register_key_type(&cifs_idmap_key_type); |
493 | if (ret < 0) | |
494 | goto failed_put_key; | |
495 | ||
496 | /* instruct request_key() to use this special keyring as a cache for | |
497 | * the results it looks up */ | |
700920eb | 498 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
4d79dba0 SP |
499 | cred->thread_keyring = keyring; |
500 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
501 | root_cred = cred; | |
502 | ||
f96637be | 503 | cifs_dbg(FYI, "cifs idmap keyring: %d\n", key_serial(keyring)); |
4d79dba0 SP |
504 | return 0; |
505 | ||
506 | failed_put_key: | |
507 | key_put(keyring); | |
508 | failed_put_cred: | |
509 | put_cred(cred); | |
510 | return ret; | |
511 | } | |
512 | ||
513 | void | |
514 | exit_cifs_idmap(void) | |
515 | { | |
516 | key_revoke(root_cred->thread_keyring); | |
517 | unregister_key_type(&cifs_idmap_key_type); | |
518 | put_cred(root_cred); | |
f96637be | 519 | cifs_dbg(FYI, "Unregistered %s key type\n", cifs_idmap_key_type.name); |
4d79dba0 SP |
520 | } |
521 | ||
97837582 SF |
522 | /* copy ntsd, owner sid, and group sid from a security descriptor to another */ |
523 | static void copy_sec_desc(const struct cifs_ntsd *pntsd, | |
524 | struct cifs_ntsd *pnntsd, __u32 sidsoffset) | |
525 | { | |
97837582 SF |
526 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
527 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; | |
528 | ||
529 | /* copy security descriptor control portion */ | |
530 | pnntsd->revision = pntsd->revision; | |
531 | pnntsd->type = pntsd->type; | |
532 | pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); | |
533 | pnntsd->sacloffset = 0; | |
534 | pnntsd->osidoffset = cpu_to_le32(sidsoffset); | |
535 | pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); | |
536 | ||
537 | /* copy owner sid */ | |
538 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
539 | le32_to_cpu(pntsd->osidoffset)); | |
540 | nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); | |
36960e44 | 541 | cifs_copy_sid(nowner_sid_ptr, owner_sid_ptr); |
97837582 SF |
542 | |
543 | /* copy group sid */ | |
544 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
545 | le32_to_cpu(pntsd->gsidoffset)); | |
546 | ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + | |
547 | sizeof(struct cifs_sid)); | |
36960e44 | 548 | cifs_copy_sid(ngroup_sid_ptr, group_sid_ptr); |
97837582 SF |
549 | |
550 | return; | |
551 | } | |
552 | ||
553 | ||
630f3f0c SF |
554 | /* |
555 | change posix mode to reflect permissions | |
556 | pmode is the existing mode (we only want to overwrite part of this | |
557 | bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 | |
558 | */ | |
9b5e6857 | 559 | static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
0f22053e | 560 | umode_t *pdenied, umode_t mask) |
630f3f0c | 561 | { |
9b5e6857 | 562 | __u32 flags = le32_to_cpu(ace_flags); |
0f22053e SP |
563 | /* |
564 | * Do not assume "preferred" or "canonical" order. | |
565 | * The first DENY or ALLOW ACE which matches perfectly is | |
566 | * the permission to be used. Once allowed or denied, same | |
567 | * permission in later ACEs do not matter. | |
568 | */ | |
569 | ||
570 | /* If not already allowed, deny these bits */ | |
15b03959 | 571 | if (type == ACCESS_DENIED) { |
0f22053e SP |
572 | if (flags & GENERIC_ALL && |
573 | !(*pmode & mask & 0777)) | |
574 | *pdenied |= mask & 0777; | |
575 | ||
576 | if (((flags & GENERIC_WRITE) || | |
577 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) && | |
578 | !(*pmode & mask & 0222)) | |
579 | *pdenied |= mask & 0222; | |
580 | ||
581 | if (((flags & GENERIC_READ) || | |
582 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) && | |
583 | !(*pmode & mask & 0444)) | |
584 | *pdenied |= mask & 0444; | |
585 | ||
586 | if (((flags & GENERIC_EXECUTE) || | |
587 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) && | |
588 | !(*pmode & mask & 0111)) | |
589 | *pdenied |= mask & 0111; | |
590 | ||
15b03959 SF |
591 | return; |
592 | } else if (type != ACCESS_ALLOWED) { | |
f96637be | 593 | cifs_dbg(VFS, "unknown access control type %d\n", type); |
15b03959 SF |
594 | return; |
595 | } | |
596 | /* else ACCESS_ALLOWED type */ | |
630f3f0c | 597 | |
0f22053e SP |
598 | if ((flags & GENERIC_ALL) && |
599 | !(*pdenied & mask & 0777)) { | |
600 | *pmode |= mask & 0777; | |
f96637be | 601 | cifs_dbg(NOISY, "all perms\n"); |
d61e5808 SF |
602 | return; |
603 | } | |
0f22053e SP |
604 | |
605 | if (((flags & GENERIC_WRITE) || | |
606 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) && | |
607 | !(*pdenied & mask & 0222)) | |
608 | *pmode |= mask & 0222; | |
609 | ||
610 | if (((flags & GENERIC_READ) || | |
611 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) && | |
612 | !(*pdenied & mask & 0444)) | |
613 | *pmode |= mask & 0444; | |
614 | ||
615 | if (((flags & GENERIC_EXECUTE) || | |
616 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) && | |
617 | !(*pdenied & mask & 0111)) | |
618 | *pmode |= mask & 0111; | |
630f3f0c | 619 | |
f2156d35 SP |
620 | /* If DELETE_CHILD is set only on an owner ACE, set sticky bit */ |
621 | if (flags & FILE_DELETE_CHILD) { | |
622 | if (mask == ACL_OWNER_MASK) { | |
623 | if (!(*pdenied & 01000)) | |
624 | *pmode |= 01000; | |
625 | } else if (!(*pdenied & 01000)) { | |
626 | *pmode &= ~01000; | |
627 | *pdenied |= 01000; | |
628 | } | |
629 | } | |
630 | ||
f52aa79d | 631 | cifs_dbg(NOISY, "access flags 0x%x mode now %04o\n", flags, *pmode); |
630f3f0c SF |
632 | return; |
633 | } | |
634 | ||
ce06c9f0 SF |
635 | /* |
636 | Generate access flags to reflect permissions mode is the existing mode. | |
637 | This function is called for every ACE in the DACL whose SID matches | |
638 | with either owner or group or everyone. | |
639 | */ | |
640 | ||
641 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, | |
642 | __u32 *pace_flags) | |
643 | { | |
644 | /* reset access mask */ | |
645 | *pace_flags = 0x0; | |
646 | ||
647 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ | |
648 | mode &= bits_to_use; | |
649 | ||
650 | /* check for R/W/X UGO since we do not know whose flags | |
651 | is this but we have cleared all the bits sans RWX for | |
652 | either user or group or other as per bits_to_use */ | |
653 | if (mode & S_IRUGO) | |
654 | *pace_flags |= SET_FILE_READ_RIGHTS; | |
655 | if (mode & S_IWUGO) | |
656 | *pace_flags |= SET_FILE_WRITE_RIGHTS; | |
657 | if (mode & S_IXUGO) | |
658 | *pace_flags |= SET_FILE_EXEC_RIGHTS; | |
659 | ||
f52aa79d | 660 | cifs_dbg(NOISY, "mode: %04o, access flags now 0x%x\n", |
f96637be | 661 | mode, *pace_flags); |
ce06c9f0 SF |
662 | return; |
663 | } | |
664 | ||
2b210adc | 665 | static __u16 fill_ace_for_sid(struct cifs_ace *pntace, |
f2156d35 SP |
666 | const struct cifs_sid *psid, __u64 nmode, |
667 | umode_t bits, __u8 access_type, | |
668 | bool allow_delete_child) | |
97837582 SF |
669 | { |
670 | int i; | |
671 | __u16 size = 0; | |
672 | __u32 access_req = 0; | |
673 | ||
0f22053e | 674 | pntace->type = access_type; |
97837582 SF |
675 | pntace->flags = 0x0; |
676 | mode_to_access_flags(nmode, bits, &access_req); | |
f2156d35 SP |
677 | |
678 | if (access_type == ACCESS_ALLOWED && allow_delete_child) | |
679 | access_req |= FILE_DELETE_CHILD; | |
680 | ||
0f22053e | 681 | if (access_type == ACCESS_ALLOWED && !access_req) |
97837582 | 682 | access_req = SET_MINIMUM_RIGHTS; |
0f22053e SP |
683 | else if (access_type == ACCESS_DENIED) |
684 | access_req &= ~SET_MINIMUM_RIGHTS; | |
f2156d35 | 685 | |
97837582 SF |
686 | pntace->access_req = cpu_to_le32(access_req); |
687 | ||
688 | pntace->sid.revision = psid->revision; | |
689 | pntace->sid.num_subauth = psid->num_subauth; | |
852e2295 | 690 | for (i = 0; i < NUM_AUTHS; i++) |
97837582 SF |
691 | pntace->sid.authority[i] = psid->authority[i]; |
692 | for (i = 0; i < psid->num_subauth; i++) | |
693 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; | |
694 | ||
695 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); | |
696 | pntace->size = cpu_to_le16(size); | |
697 | ||
ef571cad | 698 | return size; |
97837582 SF |
699 | } |
700 | ||
297647c2 | 701 | |
953f8681 SF |
702 | #ifdef CONFIG_CIFS_DEBUG2 |
703 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) | |
d0d66c44 | 704 | { |
d0d66c44 | 705 | int num_subauth; |
d0d66c44 SP |
706 | |
707 | /* validate that we do not go past end of acl */ | |
297647c2 | 708 | |
44093ca2 | 709 | if (le16_to_cpu(pace->size) < 16) { |
f96637be | 710 | cifs_dbg(VFS, "ACE too small %d\n", le16_to_cpu(pace->size)); |
44093ca2 SF |
711 | return; |
712 | } | |
713 | ||
714 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
f96637be | 715 | cifs_dbg(VFS, "ACL too small to parse ACE\n"); |
d0d66c44 | 716 | return; |
44093ca2 | 717 | } |
d0d66c44 | 718 | |
44093ca2 | 719 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 720 | if (num_subauth) { |
8f18c131 | 721 | int i; |
f96637be JP |
722 | cifs_dbg(FYI, "ACE revision %d num_auth %d type %d flags %d size %d\n", |
723 | pace->sid.revision, pace->sid.num_subauth, pace->type, | |
724 | pace->flags, le16_to_cpu(pace->size)); | |
d12fd121 | 725 | for (i = 0; i < num_subauth; ++i) { |
f96637be JP |
726 | cifs_dbg(FYI, "ACE sub_auth[%d]: 0x%x\n", |
727 | i, le32_to_cpu(pace->sid.sub_auth[i])); | |
d12fd121 SF |
728 | } |
729 | ||
730 | /* BB add length check to make sure that we do not have huge | |
731 | num auths and therefore go off the end */ | |
d12fd121 SF |
732 | } |
733 | ||
734 | return; | |
735 | } | |
953f8681 | 736 | #endif |
d12fd121 | 737 | |
a750e77c | 738 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 739 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
e2f8fbfb | 740 | struct cifs_fattr *fattr, bool mode_from_special_sid) |
d0d66c44 SP |
741 | { |
742 | int i; | |
743 | int num_aces = 0; | |
744 | int acl_size; | |
745 | char *acl_base; | |
d0d66c44 SP |
746 | struct cifs_ace **ppace; |
747 | ||
748 | /* BB need to add parm so we can store the SID BB */ | |
749 | ||
2b83457b SF |
750 | if (!pdacl) { |
751 | /* no DACL in the security descriptor, set | |
752 | all the permissions for user/group/other */ | |
0f22053e | 753 | fattr->cf_mode |= 0777; |
2b83457b SF |
754 | return; |
755 | } | |
756 | ||
d0d66c44 | 757 | /* validate that we do not go past end of acl */ |
af6f4612 | 758 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
f96637be | 759 | cifs_dbg(VFS, "ACL too small to parse DACL\n"); |
d0d66c44 SP |
760 | return; |
761 | } | |
762 | ||
f96637be JP |
763 | cifs_dbg(NOISY, "DACL revision %d size %d num aces %d\n", |
764 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), | |
765 | le32_to_cpu(pdacl->num_aces)); | |
d0d66c44 | 766 | |
7505e052 SF |
767 | /* reset rwx permissions for user/group/other. |
768 | Also, if num_aces is 0 i.e. DACL has no ACEs, | |
769 | user/group/other have no permissions */ | |
0f22053e | 770 | fattr->cf_mode &= ~(0777); |
7505e052 | 771 | |
d0d66c44 SP |
772 | acl_base = (char *)pdacl; |
773 | acl_size = sizeof(struct cifs_acl); | |
774 | ||
adbc0358 | 775 | num_aces = le32_to_cpu(pdacl->num_aces); |
a5ff3769 | 776 | if (num_aces > 0) { |
0f22053e | 777 | umode_t denied_mode = 0; |
15b03959 | 778 | |
7250170c DC |
779 | if (num_aces > ULONG_MAX / sizeof(struct cifs_ace *)) |
780 | return; | |
6da2ec56 KC |
781 | ppace = kmalloc_array(num_aces, sizeof(struct cifs_ace *), |
782 | GFP_KERNEL); | |
f96637be | 783 | if (!ppace) |
8132b65b | 784 | return; |
d0d66c44 | 785 | |
d0d66c44 | 786 | for (i = 0; i < num_aces; ++i) { |
44093ca2 | 787 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
953f8681 SF |
788 | #ifdef CONFIG_CIFS_DEBUG2 |
789 | dump_ace(ppace[i], end_of_acl); | |
790 | #endif | |
e2f8fbfb SF |
791 | if (mode_from_special_sid && |
792 | (compare_sids(&(ppace[i]->sid), | |
793 | &sid_unix_NFS_mode) == 0)) { | |
794 | /* | |
795 | * Full permissions are: | |
796 | * 07777 = S_ISUID | S_ISGID | S_ISVTX | | |
797 | * S_IRWXU | S_IRWXG | S_IRWXO | |
798 | */ | |
799 | fattr->cf_mode &= ~07777; | |
800 | fattr->cf_mode |= | |
801 | le32_to_cpu(ppace[i]->sid.sub_auth[2]); | |
802 | break; | |
0f22053e SP |
803 | } else { |
804 | if (compare_sids(&(ppace[i]->sid), pownersid) == 0) { | |
805 | access_flags_to_mode(ppace[i]->access_req, | |
806 | ppace[i]->type, | |
807 | &fattr->cf_mode, | |
808 | &denied_mode, | |
809 | ACL_OWNER_MASK); | |
810 | } else if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0) { | |
811 | access_flags_to_mode(ppace[i]->access_req, | |
812 | ppace[i]->type, | |
813 | &fattr->cf_mode, | |
814 | &denied_mode, | |
815 | ACL_GROUP_MASK); | |
816 | } else if ((compare_sids(&(ppace[i]->sid), &sid_everyone) == 0) || | |
817 | (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0)) { | |
818 | access_flags_to_mode(ppace[i]->access_req, | |
819 | ppace[i]->type, | |
820 | &fattr->cf_mode, | |
821 | &denied_mode, | |
822 | ACL_EVERYONE_MASK); | |
823 | } | |
824 | } | |
2fbc2f17 | 825 | |
e01b6400 | 826 | |
44093ca2 | 827 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
828 | (void *)ppace[i], |
829 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 830 | |
44093ca2 SF |
831 | acl_base = (char *)ppace[i]; |
832 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
833 | } |
834 | ||
835 | kfree(ppace); | |
d0d66c44 SP |
836 | } |
837 | ||
838 | return; | |
839 | } | |
840 | ||
643fbcee SF |
841 | unsigned int setup_authusers_ACE(struct cifs_ace *pntace) |
842 | { | |
843 | int i; | |
844 | unsigned int ace_size = 20; | |
845 | ||
846 | pntace->type = ACCESS_ALLOWED_ACE_TYPE; | |
847 | pntace->flags = 0x0; | |
848 | pntace->access_req = cpu_to_le32(GENERIC_ALL); | |
849 | pntace->sid.num_subauth = 1; | |
850 | pntace->sid.revision = 1; | |
851 | for (i = 0; i < NUM_AUTHS; i++) | |
852 | pntace->sid.authority[i] = sid_authusers.authority[i]; | |
853 | ||
854 | pntace->sid.sub_auth[0] = sid_authusers.sub_auth[0]; | |
855 | ||
856 | /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */ | |
857 | pntace->size = cpu_to_le16(ace_size); | |
858 | return ace_size; | |
859 | } | |
860 | ||
fdef665b SF |
861 | /* |
862 | * Fill in the special SID based on the mode. See | |
cba22b1c | 863 | * https://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx |
fdef665b SF |
864 | */ |
865 | unsigned int setup_special_mode_ACE(struct cifs_ace *pntace, __u64 nmode) | |
866 | { | |
867 | int i; | |
868 | unsigned int ace_size = 28; | |
869 | ||
870 | pntace->type = ACCESS_DENIED_ACE_TYPE; | |
871 | pntace->flags = 0x0; | |
872 | pntace->access_req = 0; | |
873 | pntace->sid.num_subauth = 3; | |
874 | pntace->sid.revision = 1; | |
875 | for (i = 0; i < NUM_AUTHS; i++) | |
876 | pntace->sid.authority[i] = sid_unix_NFS_mode.authority[i]; | |
877 | ||
878 | pntace->sid.sub_auth[0] = sid_unix_NFS_mode.sub_auth[0]; | |
879 | pntace->sid.sub_auth[1] = sid_unix_NFS_mode.sub_auth[1]; | |
880 | pntace->sid.sub_auth[2] = cpu_to_le32(nmode & 07777); | |
881 | ||
882 | /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */ | |
883 | pntace->size = cpu_to_le16(ace_size); | |
884 | return ace_size; | |
885 | } | |
bcb02034 | 886 | |
975221ec SF |
887 | unsigned int setup_special_user_owner_ACE(struct cifs_ace *pntace) |
888 | { | |
889 | int i; | |
890 | unsigned int ace_size = 28; | |
891 | ||
892 | pntace->type = ACCESS_ALLOWED_ACE_TYPE; | |
893 | pntace->flags = 0x0; | |
894 | pntace->access_req = cpu_to_le32(GENERIC_ALL); | |
895 | pntace->sid.num_subauth = 3; | |
896 | pntace->sid.revision = 1; | |
897 | for (i = 0; i < NUM_AUTHS; i++) | |
898 | pntace->sid.authority[i] = sid_unix_NFS_users.authority[i]; | |
899 | ||
900 | pntace->sid.sub_auth[0] = sid_unix_NFS_users.sub_auth[0]; | |
901 | pntace->sid.sub_auth[1] = sid_unix_NFS_users.sub_auth[1]; | |
902 | pntace->sid.sub_auth[2] = cpu_to_le32(current_fsgid().val); | |
903 | ||
904 | /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */ | |
905 | pntace->size = cpu_to_le16(ace_size); | |
906 | return ace_size; | |
907 | } | |
908 | ||
97837582 | 909 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
0f22053e | 910 | struct cifs_sid *pgrpsid, __u64 *pnmode, bool modefromsid) |
97837582 | 911 | { |
2b210adc | 912 | u16 size = 0; |
e37a02c7 | 913 | u32 num_aces = 0; |
97837582 | 914 | struct cifs_acl *pnndacl; |
0f22053e SP |
915 | __u64 nmode; |
916 | __u64 user_mode; | |
917 | __u64 group_mode; | |
918 | __u64 other_mode; | |
919 | __u64 deny_user_mode = 0; | |
920 | __u64 deny_group_mode = 0; | |
f2156d35 | 921 | bool sticky_set = false; |
97837582 SF |
922 | |
923 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); | |
924 | ||
0f22053e SP |
925 | nmode = *pnmode; |
926 | ||
22442179 SF |
927 | if (modefromsid) { |
928 | struct cifs_ace *pntace = | |
929 | (struct cifs_ace *)((char *)pnndacl + size); | |
22442179 | 930 | |
fdef665b | 931 | size += setup_special_mode_ACE(pntace, nmode); |
e37a02c7 | 932 | num_aces++; |
0f22053e | 933 | goto set_size; |
e37a02c7 AA |
934 | } |
935 | ||
0f22053e SP |
936 | /* |
937 | * We'll try to keep the mode as requested by the user. | |
938 | * But in cases where we cannot meaningfully convert that | |
939 | * into ACL, return back the updated mode, so that it is | |
940 | * updated in the inode. | |
941 | */ | |
942 | ||
943 | if (!memcmp(pownersid, pgrpsid, sizeof(struct cifs_sid))) { | |
944 | /* | |
945 | * Case when owner and group SIDs are the same. | |
946 | * Set the more restrictive of the two modes. | |
947 | */ | |
948 | user_mode = nmode & (nmode << 3) & 0700; | |
949 | group_mode = nmode & (nmode >> 3) & 0070; | |
950 | } else { | |
951 | user_mode = nmode & 0700; | |
952 | group_mode = nmode & 0070; | |
953 | } | |
954 | ||
955 | other_mode = nmode & 0007; | |
956 | ||
957 | /* We need DENY ACE when the perm is more restrictive than the next sets. */ | |
958 | deny_user_mode = ~(user_mode) & ((group_mode << 3) | (other_mode << 6)) & 0700; | |
959 | deny_group_mode = ~(group_mode) & (other_mode << 3) & 0070; | |
960 | ||
961 | *pnmode = user_mode | group_mode | other_mode | (nmode & ~0777); | |
962 | ||
f2156d35 SP |
963 | /* This tells if we should allow delete child for group and everyone. */ |
964 | if (nmode & 01000) | |
965 | sticky_set = true; | |
966 | ||
0f22053e SP |
967 | if (deny_user_mode) { |
968 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
f2156d35 | 969 | pownersid, deny_user_mode, 0700, ACCESS_DENIED, false); |
0f22053e SP |
970 | num_aces++; |
971 | } | |
972 | /* Group DENY ACE does not conflict with owner ALLOW ACE. Keep in preferred order*/ | |
973 | if (deny_group_mode && !(deny_group_mode & (user_mode >> 3))) { | |
974 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
f2156d35 | 975 | pgrpsid, deny_group_mode, 0070, ACCESS_DENIED, false); |
0f22053e SP |
976 | num_aces++; |
977 | } | |
e37a02c7 | 978 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), |
f2156d35 | 979 | pownersid, user_mode, 0700, ACCESS_ALLOWED, true); |
e37a02c7 | 980 | num_aces++; |
0f22053e SP |
981 | /* Group DENY ACE conflicts with owner ALLOW ACE. So keep it after. */ |
982 | if (deny_group_mode && (deny_group_mode & (user_mode >> 3))) { | |
983 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
f2156d35 | 984 | pgrpsid, deny_group_mode, 0070, ACCESS_DENIED, false); |
0f22053e SP |
985 | num_aces++; |
986 | } | |
e37a02c7 | 987 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), |
f2156d35 | 988 | pgrpsid, group_mode, 0070, ACCESS_ALLOWED, !sticky_set); |
e37a02c7 AA |
989 | num_aces++; |
990 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
f2156d35 | 991 | &sid_everyone, other_mode, 0007, ACCESS_ALLOWED, !sticky_set); |
e37a02c7 | 992 | num_aces++; |
22442179 | 993 | |
0f22053e | 994 | set_size: |
e37a02c7 | 995 | pndacl->num_aces = cpu_to_le32(num_aces); |
97837582 | 996 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); |
97837582 | 997 | |
ef571cad | 998 | return 0; |
97837582 SF |
999 | } |
1000 | ||
1001 | ||
bcb02034 SF |
1002 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
1003 | { | |
1004 | /* BB need to add parm so we can store the SID BB */ | |
1005 | ||
b9c7a2bb SF |
1006 | /* validate that we do not go past end of ACL - sid must be at least 8 |
1007 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
1008 | if (end_of_acl < (char *)psid + 8) { | |
f96637be | 1009 | cifs_dbg(VFS, "ACL too small to parse SID %p\n", psid); |
bcb02034 SF |
1010 | return -EINVAL; |
1011 | } | |
d0d66c44 | 1012 | |
bcb02034 | 1013 | #ifdef CONFIG_CIFS_DEBUG2 |
fc03d8a5 | 1014 | if (psid->num_subauth) { |
8f18c131 | 1015 | int i; |
f96637be JP |
1016 | cifs_dbg(FYI, "SID revision %d num_auth %d\n", |
1017 | psid->revision, psid->num_subauth); | |
bcb02034 | 1018 | |
af6f4612 | 1019 | for (i = 0; i < psid->num_subauth; i++) { |
f96637be JP |
1020 | cifs_dbg(FYI, "SID sub_auth[%d]: 0x%x\n", |
1021 | i, le32_to_cpu(psid->sub_auth[i])); | |
d0d66c44 SP |
1022 | } |
1023 | ||
d12fd121 | 1024 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 1025 | num auths and therefore go off the end */ |
f96637be JP |
1026 | cifs_dbg(FYI, "RID 0x%x\n", |
1027 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1])); | |
d0d66c44 | 1028 | } |
fc03d8a5 | 1029 | #endif |
d0d66c44 | 1030 | |
bcb02034 SF |
1031 | return 0; |
1032 | } | |
1033 | ||
d0d66c44 | 1034 | |
bcb02034 | 1035 | /* Convert CIFS ACL to POSIX form */ |
9409ae58 | 1036 | static int parse_sec_desc(struct cifs_sb_info *cifs_sb, |
e2f8fbfb SF |
1037 | struct cifs_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr, |
1038 | bool get_mode_from_special_sid) | |
bcb02034 | 1039 | { |
9409ae58 | 1040 | int rc = 0; |
bcb02034 SF |
1041 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
1042 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 | 1043 | char *end_of_acl = ((char *)pntsd) + acl_len; |
7505e052 | 1044 | __u32 dacloffset; |
bcb02034 | 1045 | |
0b8f18e3 | 1046 | if (pntsd == NULL) |
b9c7a2bb SF |
1047 | return -EIO; |
1048 | ||
bcb02034 | 1049 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 1050 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 1051 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 1052 | le32_to_cpu(pntsd->gsidoffset)); |
7505e052 | 1053 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
63d2583f | 1054 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
f96637be | 1055 | cifs_dbg(NOISY, "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n", |
af6f4612 SF |
1056 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
1057 | le32_to_cpu(pntsd->gsidoffset), | |
b6b38f70 | 1058 | le32_to_cpu(pntsd->sacloffset), dacloffset); |
b9c7a2bb | 1059 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 | 1060 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
9409ae58 | 1061 | if (rc) { |
f96637be | 1062 | cifs_dbg(FYI, "%s: Error %d parsing Owner SID\n", __func__, rc); |
9409ae58 SP |
1063 | return rc; |
1064 | } | |
1065 | rc = sid_to_id(cifs_sb, owner_sid_ptr, fattr, SIDOWNER); | |
1066 | if (rc) { | |
f96637be JP |
1067 | cifs_dbg(FYI, "%s: Error %d mapping Owner SID to uid\n", |
1068 | __func__, rc); | |
bcb02034 | 1069 | return rc; |
9409ae58 | 1070 | } |
bcb02034 SF |
1071 | |
1072 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
9409ae58 | 1073 | if (rc) { |
f96637be JP |
1074 | cifs_dbg(FYI, "%s: Error %d mapping Owner SID to gid\n", |
1075 | __func__, rc); | |
bcb02034 | 1076 | return rc; |
9409ae58 SP |
1077 | } |
1078 | rc = sid_to_id(cifs_sb, group_sid_ptr, fattr, SIDGROUP); | |
1079 | if (rc) { | |
f96637be JP |
1080 | cifs_dbg(FYI, "%s: Error %d mapping Group SID to gid\n", |
1081 | __func__, rc); | |
9409ae58 SP |
1082 | return rc; |
1083 | } | |
bcb02034 | 1084 | |
7505e052 SF |
1085 | if (dacloffset) |
1086 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, | |
e2f8fbfb | 1087 | group_sid_ptr, fattr, get_mode_from_special_sid); |
7505e052 | 1088 | else |
f96637be | 1089 | cifs_dbg(FYI, "no ACL\n"); /* BB grant all or default perms? */ |
d0d66c44 | 1090 | |
9409ae58 | 1091 | return rc; |
bcb02034 | 1092 | } |
b9c7a2bb | 1093 | |
97837582 SF |
1094 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
1095 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, | |
0f22053e | 1096 | __u32 secdesclen, __u64 *pnmode, kuid_t uid, kgid_t gid, |
a6603398 | 1097 | bool mode_from_sid, bool id_from_sid, int *aclflag) |
97837582 SF |
1098 | { |
1099 | int rc = 0; | |
1100 | __u32 dacloffset; | |
1101 | __u32 ndacloffset; | |
1102 | __u32 sidsoffset; | |
1103 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
a5ff3769 | 1104 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
97837582 SF |
1105 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ |
1106 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ | |
1107 | ||
0f22053e | 1108 | if (pnmode && *pnmode != NO_CHANGE_64) { /* chmod */ |
a5ff3769 | 1109 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
97837582 | 1110 | le32_to_cpu(pntsd->osidoffset)); |
a5ff3769 | 1111 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
97837582 | 1112 | le32_to_cpu(pntsd->gsidoffset)); |
a5ff3769 SP |
1113 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
1114 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); | |
1115 | ndacloffset = sizeof(struct cifs_ntsd); | |
1116 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); | |
1117 | ndacl_ptr->revision = dacl_ptr->revision; | |
1118 | ndacl_ptr->size = 0; | |
1119 | ndacl_ptr->num_aces = 0; | |
1120 | ||
1121 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, | |
0f22053e | 1122 | pnmode, mode_from_sid); |
a5ff3769 SP |
1123 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); |
1124 | /* copy sec desc control portion & owner and group sids */ | |
1125 | copy_sec_desc(pntsd, pnntsd, sidsoffset); | |
1126 | *aclflag = CIFS_ACL_DACL; | |
1127 | } else { | |
1128 | memcpy(pnntsd, pntsd, secdesclen); | |
8abf2775 EB |
1129 | if (uid_valid(uid)) { /* chown */ |
1130 | uid_t id; | |
a5ff3769 SP |
1131 | owner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
1132 | le32_to_cpu(pnntsd->osidoffset)); | |
1133 | nowner_sid_ptr = kmalloc(sizeof(struct cifs_sid), | |
1134 | GFP_KERNEL); | |
1135 | if (!nowner_sid_ptr) | |
1136 | return -ENOMEM; | |
8abf2775 | 1137 | id = from_kuid(&init_user_ns, uid); |
a6603398 SF |
1138 | if (id_from_sid) { |
1139 | struct owner_sid *osid = (struct owner_sid *)nowner_sid_ptr; | |
1140 | /* Populate the user ownership fields S-1-5-88-1 */ | |
1141 | osid->Revision = 1; | |
1142 | osid->NumAuth = 3; | |
1143 | osid->Authority[5] = 5; | |
1144 | osid->SubAuthorities[0] = cpu_to_le32(88); | |
1145 | osid->SubAuthorities[1] = cpu_to_le32(1); | |
1146 | osid->SubAuthorities[2] = cpu_to_le32(id); | |
1147 | } else { /* lookup sid with upcall */ | |
1148 | rc = id_to_sid(id, SIDOWNER, nowner_sid_ptr); | |
1149 | if (rc) { | |
1150 | cifs_dbg(FYI, "%s: Mapping error %d for owner id %d\n", | |
1151 | __func__, rc, id); | |
1152 | kfree(nowner_sid_ptr); | |
1153 | return rc; | |
1154 | } | |
a5ff3769 | 1155 | } |
36960e44 | 1156 | cifs_copy_sid(owner_sid_ptr, nowner_sid_ptr); |
a5ff3769 SP |
1157 | kfree(nowner_sid_ptr); |
1158 | *aclflag = CIFS_ACL_OWNER; | |
1159 | } | |
8abf2775 EB |
1160 | if (gid_valid(gid)) { /* chgrp */ |
1161 | gid_t id; | |
a5ff3769 SP |
1162 | group_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
1163 | le32_to_cpu(pnntsd->gsidoffset)); | |
1164 | ngroup_sid_ptr = kmalloc(sizeof(struct cifs_sid), | |
1165 | GFP_KERNEL); | |
1166 | if (!ngroup_sid_ptr) | |
1167 | return -ENOMEM; | |
8abf2775 | 1168 | id = from_kgid(&init_user_ns, gid); |
a6603398 SF |
1169 | if (id_from_sid) { |
1170 | struct owner_sid *gsid = (struct owner_sid *)ngroup_sid_ptr; | |
1171 | /* Populate the group ownership fields S-1-5-88-2 */ | |
1172 | gsid->Revision = 1; | |
1173 | gsid->NumAuth = 3; | |
1174 | gsid->Authority[5] = 5; | |
1175 | gsid->SubAuthorities[0] = cpu_to_le32(88); | |
1176 | gsid->SubAuthorities[1] = cpu_to_le32(2); | |
1177 | gsid->SubAuthorities[2] = cpu_to_le32(id); | |
1178 | } else { /* lookup sid with upcall */ | |
1179 | rc = id_to_sid(id, SIDGROUP, ngroup_sid_ptr); | |
1180 | if (rc) { | |
1181 | cifs_dbg(FYI, "%s: Mapping error %d for group id %d\n", | |
1182 | __func__, rc, id); | |
1183 | kfree(ngroup_sid_ptr); | |
1184 | return rc; | |
1185 | } | |
a5ff3769 | 1186 | } |
36960e44 | 1187 | cifs_copy_sid(group_sid_ptr, ngroup_sid_ptr); |
a5ff3769 SP |
1188 | kfree(ngroup_sid_ptr); |
1189 | *aclflag = CIFS_ACL_GROUP; | |
1190 | } | |
1191 | } | |
97837582 | 1192 | |
ef571cad | 1193 | return rc; |
97837582 SF |
1194 | } |
1195 | ||
42eacf9e SF |
1196 | struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, |
1197 | const struct cifs_fid *cifsfid, u32 *pacllen) | |
b9c7a2bb | 1198 | { |
b9c7a2bb | 1199 | struct cifs_ntsd *pntsd = NULL; |
6d5786a3 PS |
1200 | unsigned int xid; |
1201 | int rc; | |
7ffec372 JL |
1202 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
1203 | ||
1204 | if (IS_ERR(tlink)) | |
987b21d7 | 1205 | return ERR_CAST(tlink); |
b9c7a2bb | 1206 | |
6d5786a3 | 1207 | xid = get_xid(); |
42eacf9e SF |
1208 | rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), cifsfid->netfid, &pntsd, |
1209 | pacllen); | |
6d5786a3 | 1210 | free_xid(xid); |
b9c7a2bb | 1211 | |
7ffec372 | 1212 | cifs_put_tlink(tlink); |
b9c7a2bb | 1213 | |
f96637be | 1214 | cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
987b21d7 SP |
1215 | if (rc) |
1216 | return ERR_PTR(rc); | |
1bf4072d CH |
1217 | return pntsd; |
1218 | } | |
8b1327f6 | 1219 | |
1bf4072d CH |
1220 | static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, |
1221 | const char *path, u32 *pacllen) | |
1222 | { | |
1223 | struct cifs_ntsd *pntsd = NULL; | |
1224 | int oplock = 0; | |
6d5786a3 | 1225 | unsigned int xid; |
0f060936 | 1226 | int rc; |
96daf2b0 | 1227 | struct cifs_tcon *tcon; |
7ffec372 | 1228 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
d81b8a40 PS |
1229 | struct cifs_fid fid; |
1230 | struct cifs_open_parms oparms; | |
7ffec372 JL |
1231 | |
1232 | if (IS_ERR(tlink)) | |
987b21d7 | 1233 | return ERR_CAST(tlink); |
b9c7a2bb | 1234 | |
7ffec372 | 1235 | tcon = tlink_tcon(tlink); |
6d5786a3 | 1236 | xid = get_xid(); |
1bf4072d | 1237 | |
d81b8a40 PS |
1238 | oparms.tcon = tcon; |
1239 | oparms.cifs_sb = cifs_sb; | |
1240 | oparms.desired_access = READ_CONTROL; | |
0f060936 | 1241 | oparms.create_options = cifs_create_options(cifs_sb, 0); |
d81b8a40 PS |
1242 | oparms.disposition = FILE_OPEN; |
1243 | oparms.path = path; | |
1244 | oparms.fid = &fid; | |
1245 | oparms.reconnect = false; | |
1246 | ||
1247 | rc = CIFS_open(xid, &oparms, &oplock, NULL); | |
987b21d7 | 1248 | if (!rc) { |
d81b8a40 PS |
1249 | rc = CIFSSMBGetCIFSACL(xid, tcon, fid.netfid, &pntsd, pacllen); |
1250 | CIFSSMBClose(xid, tcon, fid.netfid); | |
b9c7a2bb SF |
1251 | } |
1252 | ||
7ffec372 | 1253 | cifs_put_tlink(tlink); |
6d5786a3 | 1254 | free_xid(xid); |
987b21d7 | 1255 | |
f96637be | 1256 | cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
987b21d7 SP |
1257 | if (rc) |
1258 | return ERR_PTR(rc); | |
7505e052 SF |
1259 | return pntsd; |
1260 | } | |
1261 | ||
1bf4072d | 1262 | /* Retrieve an ACL from the server */ |
fbeba8bb | 1263 | struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb, |
1bf4072d CH |
1264 | struct inode *inode, const char *path, |
1265 | u32 *pacllen) | |
1266 | { | |
1267 | struct cifs_ntsd *pntsd = NULL; | |
1268 | struct cifsFileInfo *open_file = NULL; | |
1269 | ||
1270 | if (inode) | |
6508d904 | 1271 | open_file = find_readable_file(CIFS_I(inode), true); |
1bf4072d CH |
1272 | if (!open_file) |
1273 | return get_cifs_acl_by_path(cifs_sb, path, pacllen); | |
1274 | ||
42eacf9e | 1275 | pntsd = get_cifs_acl_by_fid(cifs_sb, &open_file->fid, pacllen); |
6ab409b5 | 1276 | cifsFileInfo_put(open_file); |
1bf4072d CH |
1277 | return pntsd; |
1278 | } | |
1279 | ||
a5ff3769 SP |
1280 | /* Set an ACL on the server */ |
1281 | int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, | |
1282 | struct inode *inode, const char *path, int aclflag) | |
b96d31a6 CH |
1283 | { |
1284 | int oplock = 0; | |
6d5786a3 | 1285 | unsigned int xid; |
0f060936 | 1286 | int rc, access_flags; |
96daf2b0 | 1287 | struct cifs_tcon *tcon; |
a5ff3769 | 1288 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
7ffec372 | 1289 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
d81b8a40 PS |
1290 | struct cifs_fid fid; |
1291 | struct cifs_open_parms oparms; | |
97837582 | 1292 | |
7ffec372 JL |
1293 | if (IS_ERR(tlink)) |
1294 | return PTR_ERR(tlink); | |
1295 | ||
1296 | tcon = tlink_tcon(tlink); | |
6d5786a3 | 1297 | xid = get_xid(); |
97837582 | 1298 | |
a5ff3769 SP |
1299 | if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP) |
1300 | access_flags = WRITE_OWNER; | |
1301 | else | |
1302 | access_flags = WRITE_DAC; | |
1303 | ||
d81b8a40 PS |
1304 | oparms.tcon = tcon; |
1305 | oparms.cifs_sb = cifs_sb; | |
1306 | oparms.desired_access = access_flags; | |
0f060936 | 1307 | oparms.create_options = cifs_create_options(cifs_sb, 0); |
d81b8a40 PS |
1308 | oparms.disposition = FILE_OPEN; |
1309 | oparms.path = path; | |
1310 | oparms.fid = &fid; | |
1311 | oparms.reconnect = false; | |
1312 | ||
1313 | rc = CIFS_open(xid, &oparms, &oplock, NULL); | |
b96d31a6 | 1314 | if (rc) { |
f96637be | 1315 | cifs_dbg(VFS, "Unable to open file to set ACL\n"); |
b96d31a6 | 1316 | goto out; |
97837582 SF |
1317 | } |
1318 | ||
d81b8a40 | 1319 | rc = CIFSSMBSetCIFSACL(xid, tcon, fid.netfid, pnntsd, acllen, aclflag); |
f96637be | 1320 | cifs_dbg(NOISY, "SetCIFSACL rc = %d\n", rc); |
97837582 | 1321 | |
d81b8a40 | 1322 | CIFSSMBClose(xid, tcon, fid.netfid); |
7ffec372 | 1323 | out: |
6d5786a3 | 1324 | free_xid(xid); |
7ffec372 | 1325 | cifs_put_tlink(tlink); |
b96d31a6 CH |
1326 | return rc; |
1327 | } | |
97837582 | 1328 | |
36c7ce4a | 1329 | /* Translate the CIFS ACL (similar to NTFS ACL) for a file into mode bits */ |
987b21d7 | 1330 | int |
0b8f18e3 | 1331 | cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, |
e2f8fbfb SF |
1332 | struct inode *inode, bool mode_from_special_sid, |
1333 | const char *path, const struct cifs_fid *pfid) | |
7505e052 SF |
1334 | { |
1335 | struct cifs_ntsd *pntsd = NULL; | |
1336 | u32 acllen = 0; | |
1337 | int rc = 0; | |
42eacf9e | 1338 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
ecdcf622 | 1339 | struct smb_version_operations *ops; |
7505e052 | 1340 | |
f96637be | 1341 | cifs_dbg(NOISY, "converting ACL to mode for %s\n", path); |
1bf4072d | 1342 | |
42eacf9e SF |
1343 | if (IS_ERR(tlink)) |
1344 | return PTR_ERR(tlink); | |
7505e052 | 1345 | |
ecdcf622 JP |
1346 | ops = tlink_tcon(tlink)->ses->server->ops; |
1347 | ||
1348 | if (pfid && (ops->get_acl_by_fid)) | |
1349 | pntsd = ops->get_acl_by_fid(cifs_sb, pfid, &acllen); | |
1350 | else if (ops->get_acl) | |
1351 | pntsd = ops->get_acl(cifs_sb, inode, path, &acllen); | |
42eacf9e SF |
1352 | else { |
1353 | cifs_put_tlink(tlink); | |
1354 | return -EOPNOTSUPP; | |
1355 | } | |
7505e052 | 1356 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ |
987b21d7 SP |
1357 | if (IS_ERR(pntsd)) { |
1358 | rc = PTR_ERR(pntsd); | |
f96637be | 1359 | cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
e2f8fbfb SF |
1360 | } else if (mode_from_special_sid) { |
1361 | rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr, true); | |
98128572 | 1362 | kfree(pntsd); |
987b21d7 | 1363 | } else { |
e2f8fbfb SF |
1364 | /* get approximated mode from ACL */ |
1365 | rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr, false); | |
987b21d7 SP |
1366 | kfree(pntsd); |
1367 | if (rc) | |
f96637be | 1368 | cifs_dbg(VFS, "parse sec desc failed rc = %d\n", rc); |
987b21d7 | 1369 | } |
7505e052 | 1370 | |
42eacf9e SF |
1371 | cifs_put_tlink(tlink); |
1372 | ||
987b21d7 | 1373 | return rc; |
b9c7a2bb | 1374 | } |
953f8681 | 1375 | |
7505e052 | 1376 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
a5ff3769 | 1377 | int |
0f22053e | 1378 | id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 *pnmode, |
8abf2775 | 1379 | kuid_t uid, kgid_t gid) |
953f8681 SF |
1380 | { |
1381 | int rc = 0; | |
a5ff3769 | 1382 | int aclflag = CIFS_ACL_DACL; /* default flag to set */ |
cce246ee | 1383 | __u32 secdesclen = 0; |
97837582 SF |
1384 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
1385 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ | |
83e3bc23 SF |
1386 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1387 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); | |
ecdcf622 | 1388 | struct smb_version_operations *ops; |
a6603398 | 1389 | bool mode_from_sid, id_from_sid; |
83e3bc23 SF |
1390 | |
1391 | if (IS_ERR(tlink)) | |
1392 | return PTR_ERR(tlink); | |
ecdcf622 JP |
1393 | |
1394 | ops = tlink_tcon(tlink)->ses->server->ops; | |
953f8681 | 1395 | |
f96637be | 1396 | cifs_dbg(NOISY, "set ACL from mode for %s\n", path); |
953f8681 SF |
1397 | |
1398 | /* Get the security descriptor */ | |
83e3bc23 | 1399 | |
ecdcf622 | 1400 | if (ops->get_acl == NULL) { |
83e3bc23 SF |
1401 | cifs_put_tlink(tlink); |
1402 | return -EOPNOTSUPP; | |
1403 | } | |
1404 | ||
ecdcf622 | 1405 | pntsd = ops->get_acl(cifs_sb, inode, path, &secdesclen); |
987b21d7 SP |
1406 | if (IS_ERR(pntsd)) { |
1407 | rc = PTR_ERR(pntsd); | |
f96637be | 1408 | cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
83e3bc23 SF |
1409 | cifs_put_tlink(tlink); |
1410 | return rc; | |
c78cd838 | 1411 | } |
7505e052 | 1412 | |
c78cd838 JL |
1413 | /* |
1414 | * Add three ACEs for owner, group, everyone getting rid of other ACEs | |
1415 | * as chmod disables ACEs and set the security descriptor. Allocate | |
1416 | * memory for the smb header, set security descriptor request security | |
1417 | * descriptor parameters, and secuirty descriptor itself | |
1418 | */ | |
7ee0b4c6 | 1419 | secdesclen = max_t(u32, secdesclen, DEFAULT_SEC_DESC_LEN); |
c78cd838 JL |
1420 | pnntsd = kmalloc(secdesclen, GFP_KERNEL); |
1421 | if (!pnntsd) { | |
c78cd838 | 1422 | kfree(pntsd); |
83e3bc23 | 1423 | cifs_put_tlink(tlink); |
c78cd838 JL |
1424 | return -ENOMEM; |
1425 | } | |
97837582 | 1426 | |
22442179 SF |
1427 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) |
1428 | mode_from_sid = true; | |
1429 | else | |
1430 | mode_from_sid = false; | |
1431 | ||
a6603398 SF |
1432 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) |
1433 | id_from_sid = true; | |
1434 | else | |
1435 | id_from_sid = false; | |
1436 | ||
0f22053e | 1437 | rc = build_sec_desc(pntsd, pnntsd, secdesclen, pnmode, uid, gid, |
a6603398 | 1438 | mode_from_sid, id_from_sid, &aclflag); |
97837582 | 1439 | |
f96637be | 1440 | cifs_dbg(NOISY, "build_sec_desc rc: %d\n", rc); |
97837582 | 1441 | |
ecdcf622 | 1442 | if (ops->set_acl == NULL) |
83e3bc23 SF |
1443 | rc = -EOPNOTSUPP; |
1444 | ||
c78cd838 JL |
1445 | if (!rc) { |
1446 | /* Set the security descriptor */ | |
ecdcf622 | 1447 | rc = ops->set_acl(pnntsd, secdesclen, inode, path, aclflag); |
f96637be | 1448 | cifs_dbg(NOISY, "set_cifs_acl rc: %d\n", rc); |
97837582 | 1449 | } |
83e3bc23 | 1450 | cifs_put_tlink(tlink); |
97837582 | 1451 | |
c78cd838 JL |
1452 | kfree(pnntsd); |
1453 | kfree(pntsd); | |
ef571cad | 1454 | return rc; |
953f8681 | 1455 | } |