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)} }; |
bcb02034 | 42 | /* group users */ |
ad7a2926 | 43 | static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} }; |
d0d66c44 | 44 | |
b1a6dc21 | 45 | static const struct cred *root_cred; |
9409ae58 | 46 | |
4d79dba0 | 47 | static int |
cf7f601c | 48 | cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep) |
4d79dba0 SP |
49 | { |
50 | char *payload; | |
51 | ||
41a9f1f6 JL |
52 | /* |
53 | * If the payload is less than or equal to the size of a pointer, then | |
54 | * an allocation here is wasteful. Just copy the data directly to the | |
55 | * payload.value union member instead. | |
56 | * | |
57 | * With this however, you must check the datalen before trying to | |
58 | * dereference payload.data! | |
59 | */ | |
1f630680 | 60 | if (prep->datalen <= sizeof(key->payload)) { |
41a9f1f6 JL |
61 | key->payload.value = 0; |
62 | memcpy(&key->payload.value, prep->data, prep->datalen); | |
63 | key->datalen = prep->datalen; | |
64 | return 0; | |
65 | } | |
f7f7c185 | 66 | payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL); |
4d79dba0 SP |
67 | if (!payload) |
68 | return -ENOMEM; | |
69 | ||
4d79dba0 | 70 | key->payload.data = payload; |
cf7f601c | 71 | key->datalen = prep->datalen; |
4d79dba0 SP |
72 | return 0; |
73 | } | |
74 | ||
75 | static inline void | |
76 | cifs_idmap_key_destroy(struct key *key) | |
77 | { | |
1f630680 | 78 | if (key->datalen > sizeof(key->payload)) |
41a9f1f6 | 79 | kfree(key->payload.data); |
4d79dba0 SP |
80 | } |
81 | ||
b1a6dc21 | 82 | static struct key_type cifs_idmap_key_type = { |
c4aca0c0 | 83 | .name = "cifs.idmap", |
4d79dba0 SP |
84 | .instantiate = cifs_idmap_key_instantiate, |
85 | .destroy = cifs_idmap_key_destroy, | |
86 | .describe = user_describe, | |
4d79dba0 SP |
87 | }; |
88 | ||
faa65f07 JL |
89 | static char * |
90 | sid_to_key_str(struct cifs_sid *sidptr, unsigned int type) | |
9409ae58 | 91 | { |
faa65f07 | 92 | int i, len; |
ee13b2ba | 93 | unsigned int saval; |
faa65f07 | 94 | char *sidstr, *strptr; |
193cdd8a | 95 | unsigned long long id_auth_val; |
9409ae58 | 96 | |
faa65f07 JL |
97 | /* 3 bytes for prefix */ |
98 | sidstr = kmalloc(3 + SID_STRING_BASE_SIZE + | |
99 | (SID_STRING_SUBAUTH_SIZE * sidptr->num_subauth), | |
100 | GFP_KERNEL); | |
101 | if (!sidstr) | |
102 | return sidstr; | |
9409ae58 | 103 | |
faa65f07 JL |
104 | strptr = sidstr; |
105 | len = sprintf(strptr, "%cs:S-%hhu", type == SIDOWNER ? 'o' : 'g', | |
106 | sidptr->revision); | |
107 | strptr += len; | |
9409ae58 | 108 | |
193cdd8a JL |
109 | /* The authority field is a single 48-bit number */ |
110 | id_auth_val = (unsigned long long)sidptr->authority[5]; | |
111 | id_auth_val |= (unsigned long long)sidptr->authority[4] << 8; | |
112 | id_auth_val |= (unsigned long long)sidptr->authority[3] << 16; | |
113 | id_auth_val |= (unsigned long long)sidptr->authority[2] << 24; | |
114 | id_auth_val |= (unsigned long long)sidptr->authority[1] << 32; | |
115 | id_auth_val |= (unsigned long long)sidptr->authority[0] << 48; | |
116 | ||
117 | /* | |
118 | * MS-DTYP states that if the authority is >= 2^32, then it should be | |
119 | * expressed as a hex value. | |
120 | */ | |
121 | if (id_auth_val <= UINT_MAX) | |
122 | len = sprintf(strptr, "-%llu", id_auth_val); | |
123 | else | |
124 | len = sprintf(strptr, "-0x%llx", id_auth_val); | |
125 | ||
126 | strptr += len; | |
9409ae58 SP |
127 | |
128 | for (i = 0; i < sidptr->num_subauth; ++i) { | |
129 | saval = le32_to_cpu(sidptr->sub_auth[i]); | |
faa65f07 JL |
130 | len = sprintf(strptr, "-%u", saval); |
131 | strptr += len; | |
9409ae58 | 132 | } |
faa65f07 JL |
133 | |
134 | return sidstr; | |
9409ae58 SP |
135 | } |
136 | ||
436bb435 JL |
137 | /* |
138 | * if the two SIDs (roughly equivalent to a UUID for a user or group) are | |
139 | * the same returns zero, if they do not match returns non-zero. | |
140 | */ | |
141 | static int | |
142 | compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) | |
143 | { | |
144 | int i; | |
145 | int num_subauth, num_sat, num_saw; | |
146 | ||
147 | if ((!ctsid) || (!cwsid)) | |
148 | return 1; | |
149 | ||
150 | /* compare the revision */ | |
151 | if (ctsid->revision != cwsid->revision) { | |
152 | if (ctsid->revision > cwsid->revision) | |
153 | return 1; | |
154 | else | |
155 | return -1; | |
156 | } | |
157 | ||
158 | /* compare all of the six auth values */ | |
159 | for (i = 0; i < NUM_AUTHS; ++i) { | |
160 | if (ctsid->authority[i] != cwsid->authority[i]) { | |
161 | if (ctsid->authority[i] > cwsid->authority[i]) | |
162 | return 1; | |
163 | else | |
164 | return -1; | |
165 | } | |
166 | } | |
167 | ||
168 | /* compare all of the subauth values if any */ | |
169 | num_sat = ctsid->num_subauth; | |
170 | num_saw = cwsid->num_subauth; | |
171 | num_subauth = num_sat < num_saw ? num_sat : num_saw; | |
172 | if (num_subauth) { | |
173 | for (i = 0; i < num_subauth; ++i) { | |
174 | if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { | |
175 | if (le32_to_cpu(ctsid->sub_auth[i]) > | |
176 | le32_to_cpu(cwsid->sub_auth[i])) | |
177 | return 1; | |
178 | else | |
179 | return -1; | |
180 | } | |
181 | } | |
182 | } | |
183 | ||
184 | return 0; /* sids compare/match */ | |
185 | } | |
186 | ||
36960e44 JL |
187 | static void |
188 | cifs_copy_sid(struct cifs_sid *dst, const struct cifs_sid *src) | |
189 | { | |
36f87ee7 JL |
190 | int i; |
191 | ||
192 | dst->revision = src->revision; | |
30c9d6cc | 193 | dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES); |
36f87ee7 JL |
194 | for (i = 0; i < NUM_AUTHS; ++i) |
195 | dst->authority[i] = src->authority[i]; | |
196 | for (i = 0; i < dst->num_subauth; ++i) | |
197 | dst->sub_auth[i] = src->sub_auth[i]; | |
36960e44 JL |
198 | } |
199 | ||
9409ae58 | 200 | static int |
faa65f07 | 201 | id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) |
9409ae58 | 202 | { |
faa65f07 | 203 | int rc; |
21fed0d5 | 204 | struct key *sidkey; |
2ae03025 JL |
205 | struct cifs_sid *ksid; |
206 | unsigned int ksid_size; | |
faa65f07 | 207 | char desc[3 + 10 + 1]; /* 3 byte prefix + 10 bytes for value + NULL */ |
21fed0d5 | 208 | const struct cred *saved_cred; |
21fed0d5 | 209 | |
faa65f07 JL |
210 | rc = snprintf(desc, sizeof(desc), "%ci:%u", |
211 | sidtype == SIDOWNER ? 'o' : 'g', cid); | |
212 | if (rc >= sizeof(desc)) | |
213 | return -EINVAL; | |
21fed0d5 | 214 | |
faa65f07 JL |
215 | rc = 0; |
216 | saved_cred = override_creds(root_cred); | |
217 | sidkey = request_key(&cifs_idmap_key_type, desc, ""); | |
218 | if (IS_ERR(sidkey)) { | |
21fed0d5 | 219 | rc = -EINVAL; |
f96637be JP |
220 | cifs_dbg(FYI, "%s: Can't map %cid %u to a SID\n", |
221 | __func__, sidtype == SIDOWNER ? 'u' : 'g', cid); | |
faa65f07 JL |
222 | goto out_revert_creds; |
223 | } else if (sidkey->datalen < CIFS_SID_BASE_SIZE) { | |
224 | rc = -EIO; | |
f96637be JP |
225 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
226 | __func__, sidkey->datalen); | |
2ae03025 | 227 | goto invalidate_key; |
21fed0d5 | 228 | } |
2ae03025 | 229 | |
1f630680 JL |
230 | /* |
231 | * A sid is usually too large to be embedded in payload.value, but if | |
232 | * there are no subauthorities and the host has 8-byte pointers, then | |
233 | * it could be. | |
234 | */ | |
235 | ksid = sidkey->datalen <= sizeof(sidkey->payload) ? | |
236 | (struct cifs_sid *)&sidkey->payload.value : | |
237 | (struct cifs_sid *)sidkey->payload.data; | |
238 | ||
2ae03025 JL |
239 | ksid_size = CIFS_SID_BASE_SIZE + (ksid->num_subauth * sizeof(__le32)); |
240 | if (ksid_size > sidkey->datalen) { | |
241 | rc = -EIO; | |
f96637be JP |
242 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu, ksid_size=%u)\n", |
243 | __func__, sidkey->datalen, ksid_size); | |
2ae03025 JL |
244 | goto invalidate_key; |
245 | } | |
1f630680 | 246 | |
2ae03025 | 247 | cifs_copy_sid(ssid, ksid); |
faa65f07 JL |
248 | out_key_put: |
249 | key_put(sidkey); | |
250 | out_revert_creds: | |
251 | revert_creds(saved_cred); | |
21fed0d5 | 252 | return rc; |
2ae03025 JL |
253 | |
254 | invalidate_key: | |
255 | key_invalidate(sidkey); | |
256 | goto out_key_put; | |
21fed0d5 SP |
257 | } |
258 | ||
9409ae58 SP |
259 | static int |
260 | sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid, | |
261 | struct cifs_fattr *fattr, uint sidtype) | |
262 | { | |
263 | int rc; | |
faa65f07 JL |
264 | struct key *sidkey; |
265 | char *sidstr; | |
9409ae58 | 266 | const struct cred *saved_cred; |
8abf2775 EB |
267 | kuid_t fuid = cifs_sb->mnt_uid; |
268 | kgid_t fgid = cifs_sb->mnt_gid; | |
9409ae58 SP |
269 | |
270 | /* | |
faa65f07 JL |
271 | * If we have too many subauthorities, then something is really wrong. |
272 | * Just return an error. | |
9409ae58 | 273 | */ |
faa65f07 | 274 | if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) { |
f96637be JP |
275 | cifs_dbg(FYI, "%s: %u subauthorities is too many!\n", |
276 | __func__, psid->num_subauth); | |
faa65f07 | 277 | return -EIO; |
9409ae58 SP |
278 | } |
279 | ||
faa65f07 JL |
280 | sidstr = sid_to_key_str(psid, sidtype); |
281 | if (!sidstr) | |
282 | return -ENOMEM; | |
283 | ||
284 | saved_cred = override_creds(root_cred); | |
285 | sidkey = request_key(&cifs_idmap_key_type, sidstr, ""); | |
286 | if (IS_ERR(sidkey)) { | |
287 | rc = -EINVAL; | |
f96637be JP |
288 | cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n", |
289 | __func__, sidstr, sidtype == SIDOWNER ? 'u' : 'g'); | |
faa65f07 JL |
290 | goto out_revert_creds; |
291 | } | |
292 | ||
293 | /* | |
294 | * FIXME: Here we assume that uid_t and gid_t are same size. It's | |
295 | * probably a safe assumption but might be better to check based on | |
296 | * sidtype. | |
297 | */ | |
355958f2 | 298 | BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t)); |
41a9f1f6 | 299 | if (sidkey->datalen != sizeof(uid_t)) { |
faa65f07 | 300 | rc = -EIO; |
f96637be JP |
301 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
302 | __func__, sidkey->datalen); | |
2ae03025 | 303 | key_invalidate(sidkey); |
faa65f07 | 304 | goto out_key_put; |
9409ae58 SP |
305 | } |
306 | ||
8abf2775 EB |
307 | if (sidtype == SIDOWNER) { |
308 | kuid_t uid; | |
309 | uid_t id; | |
310 | memcpy(&id, &sidkey->payload.value, sizeof(uid_t)); | |
311 | uid = make_kuid(&init_user_ns, id); | |
312 | if (uid_valid(uid)) | |
313 | fuid = uid; | |
314 | } else { | |
315 | kgid_t gid; | |
316 | gid_t id; | |
317 | memcpy(&id, &sidkey->payload.value, sizeof(gid_t)); | |
318 | gid = make_kgid(&init_user_ns, id); | |
319 | if (gid_valid(gid)) | |
320 | fgid = gid; | |
321 | } | |
faa65f07 JL |
322 | |
323 | out_key_put: | |
324 | key_put(sidkey); | |
325 | out_revert_creds: | |
326 | revert_creds(saved_cred); | |
327 | kfree(sidstr); | |
9409ae58 | 328 | |
faa65f07 JL |
329 | /* |
330 | * Note that we return 0 here unconditionally. If the mapping | |
331 | * fails then we just fall back to using the mnt_uid/mnt_gid. | |
332 | */ | |
333 | if (sidtype == SIDOWNER) | |
334 | fattr->cf_uid = fuid; | |
335 | else | |
336 | fattr->cf_gid = fgid; | |
9409ae58 SP |
337 | return 0; |
338 | } | |
339 | ||
4d79dba0 SP |
340 | int |
341 | init_cifs_idmap(void) | |
342 | { | |
343 | struct cred *cred; | |
344 | struct key *keyring; | |
345 | int ret; | |
346 | ||
f96637be JP |
347 | cifs_dbg(FYI, "Registering the %s key type\n", |
348 | cifs_idmap_key_type.name); | |
4d79dba0 SP |
349 | |
350 | /* create an override credential set with a special thread keyring in | |
351 | * which requests are cached | |
352 | * | |
353 | * this is used to prevent malicious redirections from being installed | |
354 | * with add_key(). | |
355 | */ | |
356 | cred = prepare_kernel_cred(NULL); | |
357 | if (!cred) | |
358 | return -ENOMEM; | |
359 | ||
8e3028b9 EB |
360 | keyring = keyring_alloc(".cifs_idmap", |
361 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, | |
f8aa23a5 DH |
362 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | |
363 | KEY_USR_VIEW | KEY_USR_READ, | |
364 | KEY_ALLOC_NOT_IN_QUOTA, NULL); | |
4d79dba0 SP |
365 | if (IS_ERR(keyring)) { |
366 | ret = PTR_ERR(keyring); | |
367 | goto failed_put_cred; | |
368 | } | |
369 | ||
4d79dba0 SP |
370 | ret = register_key_type(&cifs_idmap_key_type); |
371 | if (ret < 0) | |
372 | goto failed_put_key; | |
373 | ||
374 | /* instruct request_key() to use this special keyring as a cache for | |
375 | * the results it looks up */ | |
700920eb | 376 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
4d79dba0 SP |
377 | cred->thread_keyring = keyring; |
378 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
379 | root_cred = cred; | |
380 | ||
f96637be | 381 | cifs_dbg(FYI, "cifs idmap keyring: %d\n", key_serial(keyring)); |
4d79dba0 SP |
382 | return 0; |
383 | ||
384 | failed_put_key: | |
385 | key_put(keyring); | |
386 | failed_put_cred: | |
387 | put_cred(cred); | |
388 | return ret; | |
389 | } | |
390 | ||
391 | void | |
392 | exit_cifs_idmap(void) | |
393 | { | |
394 | key_revoke(root_cred->thread_keyring); | |
395 | unregister_key_type(&cifs_idmap_key_type); | |
396 | put_cred(root_cred); | |
f96637be | 397 | cifs_dbg(FYI, "Unregistered %s key type\n", cifs_idmap_key_type.name); |
4d79dba0 SP |
398 | } |
399 | ||
97837582 SF |
400 | /* copy ntsd, owner sid, and group sid from a security descriptor to another */ |
401 | static void copy_sec_desc(const struct cifs_ntsd *pntsd, | |
402 | struct cifs_ntsd *pnntsd, __u32 sidsoffset) | |
403 | { | |
97837582 SF |
404 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
405 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; | |
406 | ||
407 | /* copy security descriptor control portion */ | |
408 | pnntsd->revision = pntsd->revision; | |
409 | pnntsd->type = pntsd->type; | |
410 | pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); | |
411 | pnntsd->sacloffset = 0; | |
412 | pnntsd->osidoffset = cpu_to_le32(sidsoffset); | |
413 | pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); | |
414 | ||
415 | /* copy owner sid */ | |
416 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
417 | le32_to_cpu(pntsd->osidoffset)); | |
418 | nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); | |
36960e44 | 419 | cifs_copy_sid(nowner_sid_ptr, owner_sid_ptr); |
97837582 SF |
420 | |
421 | /* copy group sid */ | |
422 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
423 | le32_to_cpu(pntsd->gsidoffset)); | |
424 | ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + | |
425 | sizeof(struct cifs_sid)); | |
36960e44 | 426 | cifs_copy_sid(ngroup_sid_ptr, group_sid_ptr); |
97837582 SF |
427 | |
428 | return; | |
429 | } | |
430 | ||
431 | ||
630f3f0c SF |
432 | /* |
433 | change posix mode to reflect permissions | |
434 | pmode is the existing mode (we only want to overwrite part of this | |
435 | bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 | |
436 | */ | |
9b5e6857 | 437 | static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
15b03959 | 438 | umode_t *pbits_to_set) |
630f3f0c | 439 | { |
9b5e6857 | 440 | __u32 flags = le32_to_cpu(ace_flags); |
15b03959 | 441 | /* the order of ACEs is important. The canonical order is to begin with |
ce06c9f0 | 442 | DENY entries followed by ALLOW, otherwise an allow entry could be |
15b03959 | 443 | encountered first, making the subsequent deny entry like "dead code" |
ce06c9f0 | 444 | which would be superflous since Windows stops when a match is made |
15b03959 SF |
445 | for the operation you are trying to perform for your user */ |
446 | ||
447 | /* For deny ACEs we change the mask so that subsequent allow access | |
448 | control entries do not turn on the bits we are denying */ | |
449 | if (type == ACCESS_DENIED) { | |
ad7a2926 | 450 | if (flags & GENERIC_ALL) |
15b03959 | 451 | *pbits_to_set &= ~S_IRWXUGO; |
ad7a2926 | 452 | |
9b5e6857 AV |
453 | if ((flags & GENERIC_WRITE) || |
454 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 455 | *pbits_to_set &= ~S_IWUGO; |
9b5e6857 AV |
456 | if ((flags & GENERIC_READ) || |
457 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 458 | *pbits_to_set &= ~S_IRUGO; |
9b5e6857 AV |
459 | if ((flags & GENERIC_EXECUTE) || |
460 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 SF |
461 | *pbits_to_set &= ~S_IXUGO; |
462 | return; | |
463 | } else if (type != ACCESS_ALLOWED) { | |
f96637be | 464 | cifs_dbg(VFS, "unknown access control type %d\n", type); |
15b03959 SF |
465 | return; |
466 | } | |
467 | /* else ACCESS_ALLOWED type */ | |
630f3f0c | 468 | |
9b5e6857 | 469 | if (flags & GENERIC_ALL) { |
15b03959 | 470 | *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
f96637be | 471 | cifs_dbg(NOISY, "all perms\n"); |
d61e5808 SF |
472 | return; |
473 | } | |
9b5e6857 AV |
474 | if ((flags & GENERIC_WRITE) || |
475 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 476 | *pmode |= (S_IWUGO & (*pbits_to_set)); |
9b5e6857 AV |
477 | if ((flags & GENERIC_READ) || |
478 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 479 | *pmode |= (S_IRUGO & (*pbits_to_set)); |
9b5e6857 AV |
480 | if ((flags & GENERIC_EXECUTE) || |
481 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 | 482 | *pmode |= (S_IXUGO & (*pbits_to_set)); |
630f3f0c | 483 | |
f96637be | 484 | cifs_dbg(NOISY, "access flags 0x%x mode now 0x%x\n", flags, *pmode); |
630f3f0c SF |
485 | return; |
486 | } | |
487 | ||
ce06c9f0 SF |
488 | /* |
489 | Generate access flags to reflect permissions mode is the existing mode. | |
490 | This function is called for every ACE in the DACL whose SID matches | |
491 | with either owner or group or everyone. | |
492 | */ | |
493 | ||
494 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, | |
495 | __u32 *pace_flags) | |
496 | { | |
497 | /* reset access mask */ | |
498 | *pace_flags = 0x0; | |
499 | ||
500 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ | |
501 | mode &= bits_to_use; | |
502 | ||
503 | /* check for R/W/X UGO since we do not know whose flags | |
504 | is this but we have cleared all the bits sans RWX for | |
505 | either user or group or other as per bits_to_use */ | |
506 | if (mode & S_IRUGO) | |
507 | *pace_flags |= SET_FILE_READ_RIGHTS; | |
508 | if (mode & S_IWUGO) | |
509 | *pace_flags |= SET_FILE_WRITE_RIGHTS; | |
510 | if (mode & S_IXUGO) | |
511 | *pace_flags |= SET_FILE_EXEC_RIGHTS; | |
512 | ||
f96637be JP |
513 | cifs_dbg(NOISY, "mode: 0x%x, access flags now 0x%x\n", |
514 | mode, *pace_flags); | |
ce06c9f0 SF |
515 | return; |
516 | } | |
517 | ||
2b210adc | 518 | static __u16 fill_ace_for_sid(struct cifs_ace *pntace, |
97837582 SF |
519 | const struct cifs_sid *psid, __u64 nmode, umode_t bits) |
520 | { | |
521 | int i; | |
522 | __u16 size = 0; | |
523 | __u32 access_req = 0; | |
524 | ||
525 | pntace->type = ACCESS_ALLOWED; | |
526 | pntace->flags = 0x0; | |
527 | mode_to_access_flags(nmode, bits, &access_req); | |
528 | if (!access_req) | |
529 | access_req = SET_MINIMUM_RIGHTS; | |
530 | pntace->access_req = cpu_to_le32(access_req); | |
531 | ||
532 | pntace->sid.revision = psid->revision; | |
533 | pntace->sid.num_subauth = psid->num_subauth; | |
852e2295 | 534 | for (i = 0; i < NUM_AUTHS; i++) |
97837582 SF |
535 | pntace->sid.authority[i] = psid->authority[i]; |
536 | for (i = 0; i < psid->num_subauth; i++) | |
537 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; | |
538 | ||
539 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); | |
540 | pntace->size = cpu_to_le16(size); | |
541 | ||
ef571cad | 542 | return size; |
97837582 SF |
543 | } |
544 | ||
297647c2 | 545 | |
953f8681 SF |
546 | #ifdef CONFIG_CIFS_DEBUG2 |
547 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) | |
d0d66c44 | 548 | { |
d0d66c44 | 549 | int num_subauth; |
d0d66c44 SP |
550 | |
551 | /* validate that we do not go past end of acl */ | |
297647c2 | 552 | |
44093ca2 | 553 | if (le16_to_cpu(pace->size) < 16) { |
f96637be | 554 | cifs_dbg(VFS, "ACE too small %d\n", le16_to_cpu(pace->size)); |
44093ca2 SF |
555 | return; |
556 | } | |
557 | ||
558 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
f96637be | 559 | cifs_dbg(VFS, "ACL too small to parse ACE\n"); |
d0d66c44 | 560 | return; |
44093ca2 | 561 | } |
d0d66c44 | 562 | |
44093ca2 | 563 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 564 | if (num_subauth) { |
8f18c131 | 565 | int i; |
f96637be JP |
566 | cifs_dbg(FYI, "ACE revision %d num_auth %d type %d flags %d size %d\n", |
567 | pace->sid.revision, pace->sid.num_subauth, pace->type, | |
568 | pace->flags, le16_to_cpu(pace->size)); | |
d12fd121 | 569 | for (i = 0; i < num_subauth; ++i) { |
f96637be JP |
570 | cifs_dbg(FYI, "ACE sub_auth[%d]: 0x%x\n", |
571 | i, le32_to_cpu(pace->sid.sub_auth[i])); | |
d12fd121 SF |
572 | } |
573 | ||
574 | /* BB add length check to make sure that we do not have huge | |
575 | num auths and therefore go off the end */ | |
d12fd121 SF |
576 | } |
577 | ||
578 | return; | |
579 | } | |
953f8681 | 580 | #endif |
d12fd121 | 581 | |
d0d66c44 | 582 | |
a750e77c | 583 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 584 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
0b8f18e3 | 585 | struct cifs_fattr *fattr) |
d0d66c44 SP |
586 | { |
587 | int i; | |
588 | int num_aces = 0; | |
589 | int acl_size; | |
590 | char *acl_base; | |
d0d66c44 SP |
591 | struct cifs_ace **ppace; |
592 | ||
593 | /* BB need to add parm so we can store the SID BB */ | |
594 | ||
2b83457b SF |
595 | if (!pdacl) { |
596 | /* no DACL in the security descriptor, set | |
597 | all the permissions for user/group/other */ | |
0b8f18e3 | 598 | fattr->cf_mode |= S_IRWXUGO; |
2b83457b SF |
599 | return; |
600 | } | |
601 | ||
d0d66c44 | 602 | /* validate that we do not go past end of acl */ |
af6f4612 | 603 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
f96637be | 604 | cifs_dbg(VFS, "ACL too small to parse DACL\n"); |
d0d66c44 SP |
605 | return; |
606 | } | |
607 | ||
f96637be JP |
608 | cifs_dbg(NOISY, "DACL revision %d size %d num aces %d\n", |
609 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), | |
610 | le32_to_cpu(pdacl->num_aces)); | |
d0d66c44 | 611 | |
7505e052 SF |
612 | /* reset rwx permissions for user/group/other. |
613 | Also, if num_aces is 0 i.e. DACL has no ACEs, | |
614 | user/group/other have no permissions */ | |
0b8f18e3 | 615 | fattr->cf_mode &= ~(S_IRWXUGO); |
7505e052 | 616 | |
d0d66c44 SP |
617 | acl_base = (char *)pdacl; |
618 | acl_size = sizeof(struct cifs_acl); | |
619 | ||
adbc0358 | 620 | num_aces = le32_to_cpu(pdacl->num_aces); |
a5ff3769 | 621 | if (num_aces > 0) { |
15b03959 SF |
622 | umode_t user_mask = S_IRWXU; |
623 | umode_t group_mask = S_IRWXG; | |
2fbc2f17 | 624 | umode_t other_mask = S_IRWXU | S_IRWXG | S_IRWXO; |
15b03959 | 625 | |
7250170c DC |
626 | if (num_aces > ULONG_MAX / sizeof(struct cifs_ace *)) |
627 | return; | |
d0d66c44 SP |
628 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
629 | GFP_KERNEL); | |
f96637be | 630 | if (!ppace) |
8132b65b | 631 | return; |
d0d66c44 | 632 | |
d0d66c44 | 633 | for (i = 0; i < num_aces; ++i) { |
44093ca2 | 634 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
953f8681 SF |
635 | #ifdef CONFIG_CIFS_DEBUG2 |
636 | dump_ace(ppace[i], end_of_acl); | |
637 | #endif | |
9409ae58 | 638 | if (compare_sids(&(ppace[i]->sid), pownersid) == 0) |
e01b6400 | 639 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 640 | ppace[i]->type, |
0b8f18e3 | 641 | &fattr->cf_mode, |
15b03959 | 642 | &user_mask); |
9409ae58 | 643 | if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0) |
e01b6400 | 644 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 645 | ppace[i]->type, |
0b8f18e3 | 646 | &fattr->cf_mode, |
15b03959 | 647 | &group_mask); |
9409ae58 | 648 | if (compare_sids(&(ppace[i]->sid), &sid_everyone) == 0) |
e01b6400 | 649 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 650 | ppace[i]->type, |
0b8f18e3 | 651 | &fattr->cf_mode, |
15b03959 | 652 | &other_mask); |
9409ae58 | 653 | if (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0) |
2fbc2f17 SP |
654 | access_flags_to_mode(ppace[i]->access_req, |
655 | ppace[i]->type, | |
656 | &fattr->cf_mode, | |
657 | &other_mask); | |
658 | ||
e01b6400 | 659 | |
44093ca2 | 660 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
661 | (void *)ppace[i], |
662 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 663 | |
44093ca2 SF |
664 | acl_base = (char *)ppace[i]; |
665 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
666 | } |
667 | ||
668 | kfree(ppace); | |
d0d66c44 SP |
669 | } |
670 | ||
671 | return; | |
672 | } | |
673 | ||
bcb02034 | 674 | |
97837582 SF |
675 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
676 | struct cifs_sid *pgrpsid, __u64 nmode) | |
677 | { | |
2b210adc | 678 | u16 size = 0; |
97837582 SF |
679 | struct cifs_acl *pnndacl; |
680 | ||
681 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); | |
682 | ||
683 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), | |
684 | pownersid, nmode, S_IRWXU); | |
685 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
686 | pgrpsid, nmode, S_IRWXG); | |
687 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
688 | &sid_everyone, nmode, S_IRWXO); | |
689 | ||
690 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); | |
d9f382ef | 691 | pndacl->num_aces = cpu_to_le32(3); |
97837582 | 692 | |
ef571cad | 693 | return 0; |
97837582 SF |
694 | } |
695 | ||
696 | ||
bcb02034 SF |
697 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
698 | { | |
699 | /* BB need to add parm so we can store the SID BB */ | |
700 | ||
b9c7a2bb SF |
701 | /* validate that we do not go past end of ACL - sid must be at least 8 |
702 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
703 | if (end_of_acl < (char *)psid + 8) { | |
f96637be | 704 | cifs_dbg(VFS, "ACL too small to parse SID %p\n", psid); |
bcb02034 SF |
705 | return -EINVAL; |
706 | } | |
d0d66c44 | 707 | |
bcb02034 | 708 | #ifdef CONFIG_CIFS_DEBUG2 |
fc03d8a5 | 709 | if (psid->num_subauth) { |
8f18c131 | 710 | int i; |
f96637be JP |
711 | cifs_dbg(FYI, "SID revision %d num_auth %d\n", |
712 | psid->revision, psid->num_subauth); | |
bcb02034 | 713 | |
af6f4612 | 714 | for (i = 0; i < psid->num_subauth; i++) { |
f96637be JP |
715 | cifs_dbg(FYI, "SID sub_auth[%d]: 0x%x\n", |
716 | i, le32_to_cpu(psid->sub_auth[i])); | |
d0d66c44 SP |
717 | } |
718 | ||
d12fd121 | 719 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 720 | num auths and therefore go off the end */ |
f96637be JP |
721 | cifs_dbg(FYI, "RID 0x%x\n", |
722 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1])); | |
d0d66c44 | 723 | } |
fc03d8a5 | 724 | #endif |
d0d66c44 | 725 | |
bcb02034 SF |
726 | return 0; |
727 | } | |
728 | ||
d0d66c44 | 729 | |
bcb02034 | 730 | /* Convert CIFS ACL to POSIX form */ |
9409ae58 SP |
731 | static int parse_sec_desc(struct cifs_sb_info *cifs_sb, |
732 | struct cifs_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr) | |
bcb02034 | 733 | { |
9409ae58 | 734 | int rc = 0; |
bcb02034 SF |
735 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
736 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 | 737 | char *end_of_acl = ((char *)pntsd) + acl_len; |
7505e052 | 738 | __u32 dacloffset; |
bcb02034 | 739 | |
0b8f18e3 | 740 | if (pntsd == NULL) |
b9c7a2bb SF |
741 | return -EIO; |
742 | ||
bcb02034 | 743 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 744 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 745 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 746 | le32_to_cpu(pntsd->gsidoffset)); |
7505e052 | 747 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
63d2583f | 748 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
f96637be | 749 | cifs_dbg(NOISY, "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n", |
af6f4612 SF |
750 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
751 | le32_to_cpu(pntsd->gsidoffset), | |
b6b38f70 | 752 | le32_to_cpu(pntsd->sacloffset), dacloffset); |
b9c7a2bb | 753 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 | 754 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
9409ae58 | 755 | if (rc) { |
f96637be | 756 | cifs_dbg(FYI, "%s: Error %d parsing Owner SID\n", __func__, rc); |
9409ae58 SP |
757 | return rc; |
758 | } | |
759 | rc = sid_to_id(cifs_sb, owner_sid_ptr, fattr, SIDOWNER); | |
760 | if (rc) { | |
f96637be JP |
761 | cifs_dbg(FYI, "%s: Error %d mapping Owner SID to uid\n", |
762 | __func__, rc); | |
bcb02034 | 763 | return rc; |
9409ae58 | 764 | } |
bcb02034 SF |
765 | |
766 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
9409ae58 | 767 | if (rc) { |
f96637be JP |
768 | cifs_dbg(FYI, "%s: Error %d mapping Owner SID to gid\n", |
769 | __func__, rc); | |
bcb02034 | 770 | return rc; |
9409ae58 SP |
771 | } |
772 | rc = sid_to_id(cifs_sb, group_sid_ptr, fattr, SIDGROUP); | |
773 | if (rc) { | |
f96637be JP |
774 | cifs_dbg(FYI, "%s: Error %d mapping Group SID to gid\n", |
775 | __func__, rc); | |
9409ae58 SP |
776 | return rc; |
777 | } | |
bcb02034 | 778 | |
7505e052 SF |
779 | if (dacloffset) |
780 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, | |
0b8f18e3 | 781 | group_sid_ptr, fattr); |
7505e052 | 782 | else |
f96637be | 783 | cifs_dbg(FYI, "no ACL\n"); /* BB grant all or default perms? */ |
d0d66c44 | 784 | |
9409ae58 | 785 | return rc; |
bcb02034 | 786 | } |
b9c7a2bb | 787 | |
97837582 SF |
788 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
789 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, | |
8abf2775 | 790 | __u32 secdesclen, __u64 nmode, kuid_t uid, kgid_t gid, int *aclflag) |
97837582 SF |
791 | { |
792 | int rc = 0; | |
793 | __u32 dacloffset; | |
794 | __u32 ndacloffset; | |
795 | __u32 sidsoffset; | |
796 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
a5ff3769 | 797 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
97837582 SF |
798 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ |
799 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ | |
800 | ||
a5ff3769 SP |
801 | if (nmode != NO_CHANGE_64) { /* chmod */ |
802 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
97837582 | 803 | le32_to_cpu(pntsd->osidoffset)); |
a5ff3769 | 804 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
97837582 | 805 | le32_to_cpu(pntsd->gsidoffset)); |
a5ff3769 SP |
806 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
807 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); | |
808 | ndacloffset = sizeof(struct cifs_ntsd); | |
809 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); | |
810 | ndacl_ptr->revision = dacl_ptr->revision; | |
811 | ndacl_ptr->size = 0; | |
812 | ndacl_ptr->num_aces = 0; | |
813 | ||
814 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, | |
815 | nmode); | |
816 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); | |
817 | /* copy sec desc control portion & owner and group sids */ | |
818 | copy_sec_desc(pntsd, pnntsd, sidsoffset); | |
819 | *aclflag = CIFS_ACL_DACL; | |
820 | } else { | |
821 | memcpy(pnntsd, pntsd, secdesclen); | |
8abf2775 EB |
822 | if (uid_valid(uid)) { /* chown */ |
823 | uid_t id; | |
a5ff3769 SP |
824 | owner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
825 | le32_to_cpu(pnntsd->osidoffset)); | |
826 | nowner_sid_ptr = kmalloc(sizeof(struct cifs_sid), | |
827 | GFP_KERNEL); | |
828 | if (!nowner_sid_ptr) | |
829 | return -ENOMEM; | |
8abf2775 EB |
830 | id = from_kuid(&init_user_ns, uid); |
831 | rc = id_to_sid(id, SIDOWNER, nowner_sid_ptr); | |
a5ff3769 | 832 | if (rc) { |
f96637be JP |
833 | cifs_dbg(FYI, "%s: Mapping error %d for owner id %d\n", |
834 | __func__, rc, id); | |
a5ff3769 SP |
835 | kfree(nowner_sid_ptr); |
836 | return rc; | |
837 | } | |
36960e44 | 838 | cifs_copy_sid(owner_sid_ptr, nowner_sid_ptr); |
a5ff3769 SP |
839 | kfree(nowner_sid_ptr); |
840 | *aclflag = CIFS_ACL_OWNER; | |
841 | } | |
8abf2775 EB |
842 | if (gid_valid(gid)) { /* chgrp */ |
843 | gid_t id; | |
a5ff3769 SP |
844 | group_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
845 | le32_to_cpu(pnntsd->gsidoffset)); | |
846 | ngroup_sid_ptr = kmalloc(sizeof(struct cifs_sid), | |
847 | GFP_KERNEL); | |
848 | if (!ngroup_sid_ptr) | |
849 | return -ENOMEM; | |
8abf2775 EB |
850 | id = from_kgid(&init_user_ns, gid); |
851 | rc = id_to_sid(id, SIDGROUP, ngroup_sid_ptr); | |
a5ff3769 | 852 | if (rc) { |
f96637be JP |
853 | cifs_dbg(FYI, "%s: Mapping error %d for group id %d\n", |
854 | __func__, rc, id); | |
a5ff3769 SP |
855 | kfree(ngroup_sid_ptr); |
856 | return rc; | |
857 | } | |
36960e44 | 858 | cifs_copy_sid(group_sid_ptr, ngroup_sid_ptr); |
a5ff3769 SP |
859 | kfree(ngroup_sid_ptr); |
860 | *aclflag = CIFS_ACL_GROUP; | |
861 | } | |
862 | } | |
97837582 | 863 | |
ef571cad | 864 | return rc; |
97837582 SF |
865 | } |
866 | ||
42eacf9e SF |
867 | struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, |
868 | const struct cifs_fid *cifsfid, u32 *pacllen) | |
b9c7a2bb | 869 | { |
b9c7a2bb | 870 | struct cifs_ntsd *pntsd = NULL; |
6d5786a3 PS |
871 | unsigned int xid; |
872 | int rc; | |
7ffec372 JL |
873 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
874 | ||
875 | if (IS_ERR(tlink)) | |
987b21d7 | 876 | return ERR_CAST(tlink); |
b9c7a2bb | 877 | |
6d5786a3 | 878 | xid = get_xid(); |
42eacf9e SF |
879 | rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), cifsfid->netfid, &pntsd, |
880 | pacllen); | |
6d5786a3 | 881 | free_xid(xid); |
b9c7a2bb | 882 | |
7ffec372 | 883 | cifs_put_tlink(tlink); |
b9c7a2bb | 884 | |
f96637be | 885 | cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
987b21d7 SP |
886 | if (rc) |
887 | return ERR_PTR(rc); | |
1bf4072d CH |
888 | return pntsd; |
889 | } | |
8b1327f6 | 890 | |
1bf4072d CH |
891 | static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, |
892 | const char *path, u32 *pacllen) | |
893 | { | |
894 | struct cifs_ntsd *pntsd = NULL; | |
895 | int oplock = 0; | |
6d5786a3 PS |
896 | unsigned int xid; |
897 | int rc, create_options = 0; | |
96daf2b0 | 898 | struct cifs_tcon *tcon; |
7ffec372 | 899 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
d81b8a40 PS |
900 | struct cifs_fid fid; |
901 | struct cifs_open_parms oparms; | |
7ffec372 JL |
902 | |
903 | if (IS_ERR(tlink)) | |
987b21d7 | 904 | return ERR_CAST(tlink); |
b9c7a2bb | 905 | |
7ffec372 | 906 | tcon = tlink_tcon(tlink); |
6d5786a3 | 907 | xid = get_xid(); |
1bf4072d | 908 | |
3d3ea8e6 SP |
909 | if (backup_cred(cifs_sb)) |
910 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
911 | ||
d81b8a40 PS |
912 | oparms.tcon = tcon; |
913 | oparms.cifs_sb = cifs_sb; | |
914 | oparms.desired_access = READ_CONTROL; | |
915 | oparms.create_options = create_options; | |
916 | oparms.disposition = FILE_OPEN; | |
917 | oparms.path = path; | |
918 | oparms.fid = &fid; | |
919 | oparms.reconnect = false; | |
920 | ||
921 | rc = CIFS_open(xid, &oparms, &oplock, NULL); | |
987b21d7 | 922 | if (!rc) { |
d81b8a40 PS |
923 | rc = CIFSSMBGetCIFSACL(xid, tcon, fid.netfid, &pntsd, pacllen); |
924 | CIFSSMBClose(xid, tcon, fid.netfid); | |
b9c7a2bb SF |
925 | } |
926 | ||
7ffec372 | 927 | cifs_put_tlink(tlink); |
6d5786a3 | 928 | free_xid(xid); |
987b21d7 | 929 | |
f96637be | 930 | cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
987b21d7 SP |
931 | if (rc) |
932 | return ERR_PTR(rc); | |
7505e052 SF |
933 | return pntsd; |
934 | } | |
935 | ||
1bf4072d | 936 | /* Retrieve an ACL from the server */ |
fbeba8bb | 937 | struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb, |
1bf4072d CH |
938 | struct inode *inode, const char *path, |
939 | u32 *pacllen) | |
940 | { | |
941 | struct cifs_ntsd *pntsd = NULL; | |
942 | struct cifsFileInfo *open_file = NULL; | |
943 | ||
944 | if (inode) | |
6508d904 | 945 | open_file = find_readable_file(CIFS_I(inode), true); |
1bf4072d CH |
946 | if (!open_file) |
947 | return get_cifs_acl_by_path(cifs_sb, path, pacllen); | |
948 | ||
42eacf9e | 949 | pntsd = get_cifs_acl_by_fid(cifs_sb, &open_file->fid, pacllen); |
6ab409b5 | 950 | cifsFileInfo_put(open_file); |
1bf4072d CH |
951 | return pntsd; |
952 | } | |
953 | ||
a5ff3769 SP |
954 | /* Set an ACL on the server */ |
955 | int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, | |
956 | struct inode *inode, const char *path, int aclflag) | |
b96d31a6 CH |
957 | { |
958 | int oplock = 0; | |
6d5786a3 PS |
959 | unsigned int xid; |
960 | int rc, access_flags, create_options = 0; | |
96daf2b0 | 961 | struct cifs_tcon *tcon; |
a5ff3769 | 962 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
7ffec372 | 963 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
d81b8a40 PS |
964 | struct cifs_fid fid; |
965 | struct cifs_open_parms oparms; | |
97837582 | 966 | |
7ffec372 JL |
967 | if (IS_ERR(tlink)) |
968 | return PTR_ERR(tlink); | |
969 | ||
970 | tcon = tlink_tcon(tlink); | |
6d5786a3 | 971 | xid = get_xid(); |
97837582 | 972 | |
3d3ea8e6 SP |
973 | if (backup_cred(cifs_sb)) |
974 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
975 | ||
a5ff3769 SP |
976 | if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP) |
977 | access_flags = WRITE_OWNER; | |
978 | else | |
979 | access_flags = WRITE_DAC; | |
980 | ||
d81b8a40 PS |
981 | oparms.tcon = tcon; |
982 | oparms.cifs_sb = cifs_sb; | |
983 | oparms.desired_access = access_flags; | |
984 | oparms.create_options = create_options; | |
985 | oparms.disposition = FILE_OPEN; | |
986 | oparms.path = path; | |
987 | oparms.fid = &fid; | |
988 | oparms.reconnect = false; | |
989 | ||
990 | rc = CIFS_open(xid, &oparms, &oplock, NULL); | |
b96d31a6 | 991 | if (rc) { |
f96637be | 992 | cifs_dbg(VFS, "Unable to open file to set ACL\n"); |
b96d31a6 | 993 | goto out; |
97837582 SF |
994 | } |
995 | ||
d81b8a40 | 996 | rc = CIFSSMBSetCIFSACL(xid, tcon, fid.netfid, pnntsd, acllen, aclflag); |
f96637be | 997 | cifs_dbg(NOISY, "SetCIFSACL rc = %d\n", rc); |
97837582 | 998 | |
d81b8a40 | 999 | CIFSSMBClose(xid, tcon, fid.netfid); |
7ffec372 | 1000 | out: |
6d5786a3 | 1001 | free_xid(xid); |
7ffec372 | 1002 | cifs_put_tlink(tlink); |
b96d31a6 CH |
1003 | return rc; |
1004 | } | |
97837582 | 1005 | |
7505e052 | 1006 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ |
987b21d7 | 1007 | int |
0b8f18e3 | 1008 | cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, |
42eacf9e SF |
1009 | struct inode *inode, const char *path, |
1010 | const struct cifs_fid *pfid) | |
7505e052 SF |
1011 | { |
1012 | struct cifs_ntsd *pntsd = NULL; | |
1013 | u32 acllen = 0; | |
1014 | int rc = 0; | |
42eacf9e SF |
1015 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
1016 | struct cifs_tcon *tcon; | |
7505e052 | 1017 | |
f96637be | 1018 | cifs_dbg(NOISY, "converting ACL to mode for %s\n", path); |
1bf4072d | 1019 | |
42eacf9e SF |
1020 | if (IS_ERR(tlink)) |
1021 | return PTR_ERR(tlink); | |
1022 | tcon = tlink_tcon(tlink); | |
7505e052 | 1023 | |
42eacf9e SF |
1024 | if (pfid && (tcon->ses->server->ops->get_acl_by_fid)) |
1025 | pntsd = tcon->ses->server->ops->get_acl_by_fid(cifs_sb, pfid, | |
1026 | &acllen); | |
1027 | else if (tcon->ses->server->ops->get_acl) | |
1028 | pntsd = tcon->ses->server->ops->get_acl(cifs_sb, inode, path, | |
1029 | &acllen); | |
1030 | else { | |
1031 | cifs_put_tlink(tlink); | |
1032 | return -EOPNOTSUPP; | |
1033 | } | |
7505e052 | 1034 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ |
987b21d7 SP |
1035 | if (IS_ERR(pntsd)) { |
1036 | rc = PTR_ERR(pntsd); | |
f96637be | 1037 | cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
987b21d7 | 1038 | } else { |
9409ae58 | 1039 | rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr); |
987b21d7 SP |
1040 | kfree(pntsd); |
1041 | if (rc) | |
f96637be | 1042 | cifs_dbg(VFS, "parse sec desc failed rc = %d\n", rc); |
987b21d7 | 1043 | } |
7505e052 | 1044 | |
42eacf9e SF |
1045 | cifs_put_tlink(tlink); |
1046 | ||
987b21d7 | 1047 | return rc; |
b9c7a2bb | 1048 | } |
953f8681 | 1049 | |
7505e052 | 1050 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
a5ff3769 SP |
1051 | int |
1052 | id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode, | |
8abf2775 | 1053 | kuid_t uid, kgid_t gid) |
953f8681 SF |
1054 | { |
1055 | int rc = 0; | |
a5ff3769 | 1056 | int aclflag = CIFS_ACL_DACL; /* default flag to set */ |
cce246ee | 1057 | __u32 secdesclen = 0; |
97837582 SF |
1058 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
1059 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ | |
83e3bc23 SF |
1060 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1061 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); | |
1062 | struct cifs_tcon *tcon; | |
1063 | ||
1064 | if (IS_ERR(tlink)) | |
1065 | return PTR_ERR(tlink); | |
1066 | tcon = tlink_tcon(tlink); | |
953f8681 | 1067 | |
f96637be | 1068 | cifs_dbg(NOISY, "set ACL from mode for %s\n", path); |
953f8681 SF |
1069 | |
1070 | /* Get the security descriptor */ | |
83e3bc23 SF |
1071 | |
1072 | if (tcon->ses->server->ops->get_acl == NULL) { | |
1073 | cifs_put_tlink(tlink); | |
1074 | return -EOPNOTSUPP; | |
1075 | } | |
1076 | ||
1077 | pntsd = tcon->ses->server->ops->get_acl(cifs_sb, inode, path, | |
1078 | &secdesclen); | |
987b21d7 SP |
1079 | if (IS_ERR(pntsd)) { |
1080 | rc = PTR_ERR(pntsd); | |
f96637be | 1081 | cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
83e3bc23 SF |
1082 | cifs_put_tlink(tlink); |
1083 | return rc; | |
c78cd838 | 1084 | } |
7505e052 | 1085 | |
c78cd838 JL |
1086 | /* |
1087 | * Add three ACEs for owner, group, everyone getting rid of other ACEs | |
1088 | * as chmod disables ACEs and set the security descriptor. Allocate | |
1089 | * memory for the smb header, set security descriptor request security | |
1090 | * descriptor parameters, and secuirty descriptor itself | |
1091 | */ | |
7ee0b4c6 | 1092 | secdesclen = max_t(u32, secdesclen, DEFAULT_SEC_DESC_LEN); |
c78cd838 JL |
1093 | pnntsd = kmalloc(secdesclen, GFP_KERNEL); |
1094 | if (!pnntsd) { | |
c78cd838 | 1095 | kfree(pntsd); |
83e3bc23 | 1096 | cifs_put_tlink(tlink); |
c78cd838 JL |
1097 | return -ENOMEM; |
1098 | } | |
97837582 | 1099 | |
c78cd838 JL |
1100 | rc = build_sec_desc(pntsd, pnntsd, secdesclen, nmode, uid, gid, |
1101 | &aclflag); | |
97837582 | 1102 | |
f96637be | 1103 | cifs_dbg(NOISY, "build_sec_desc rc: %d\n", rc); |
97837582 | 1104 | |
83e3bc23 SF |
1105 | if (tcon->ses->server->ops->set_acl == NULL) |
1106 | rc = -EOPNOTSUPP; | |
1107 | ||
c78cd838 JL |
1108 | if (!rc) { |
1109 | /* Set the security descriptor */ | |
83e3bc23 SF |
1110 | rc = tcon->ses->server->ops->set_acl(pnntsd, secdesclen, inode, |
1111 | path, aclflag); | |
f96637be | 1112 | cifs_dbg(NOISY, "set_cifs_acl rc: %d\n", rc); |
97837582 | 1113 | } |
83e3bc23 | 1114 | cifs_put_tlink(tlink); |
97837582 | 1115 | |
c78cd838 JL |
1116 | kfree(pnntsd); |
1117 | kfree(pntsd); | |
ef571cad | 1118 | return rc; |
953f8681 | 1119 | } |