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 = { | |
4f61258f | 41 | 1, 1, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(11)} }; |
bcb02034 | 42 | /* group users */ |
ad7a2926 | 43 | static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} }; |
d0d66c44 | 44 | |
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, | |
87 | .match = user_match, | |
88 | }; | |
89 | ||
faa65f07 JL |
90 | static char * |
91 | sid_to_key_str(struct cifs_sid *sidptr, unsigned int type) | |
9409ae58 | 92 | { |
faa65f07 | 93 | int i, len; |
ee13b2ba | 94 | unsigned int saval; |
faa65f07 | 95 | char *sidstr, *strptr; |
193cdd8a | 96 | unsigned long long id_auth_val; |
9409ae58 | 97 | |
faa65f07 JL |
98 | /* 3 bytes for prefix */ |
99 | sidstr = kmalloc(3 + SID_STRING_BASE_SIZE + | |
100 | (SID_STRING_SUBAUTH_SIZE * sidptr->num_subauth), | |
101 | GFP_KERNEL); | |
102 | if (!sidstr) | |
103 | return sidstr; | |
9409ae58 | 104 | |
faa65f07 JL |
105 | strptr = sidstr; |
106 | len = sprintf(strptr, "%cs:S-%hhu", type == SIDOWNER ? 'o' : 'g', | |
107 | sidptr->revision); | |
108 | strptr += len; | |
9409ae58 | 109 | |
193cdd8a JL |
110 | /* The authority field is a single 48-bit number */ |
111 | id_auth_val = (unsigned long long)sidptr->authority[5]; | |
112 | id_auth_val |= (unsigned long long)sidptr->authority[4] << 8; | |
113 | id_auth_val |= (unsigned long long)sidptr->authority[3] << 16; | |
114 | id_auth_val |= (unsigned long long)sidptr->authority[2] << 24; | |
115 | id_auth_val |= (unsigned long long)sidptr->authority[1] << 32; | |
116 | id_auth_val |= (unsigned long long)sidptr->authority[0] << 48; | |
117 | ||
118 | /* | |
119 | * MS-DTYP states that if the authority is >= 2^32, then it should be | |
120 | * expressed as a hex value. | |
121 | */ | |
122 | if (id_auth_val <= UINT_MAX) | |
123 | len = sprintf(strptr, "-%llu", id_auth_val); | |
124 | else | |
125 | len = sprintf(strptr, "-0x%llx", id_auth_val); | |
126 | ||
127 | strptr += len; | |
9409ae58 SP |
128 | |
129 | for (i = 0; i < sidptr->num_subauth; ++i) { | |
130 | saval = le32_to_cpu(sidptr->sub_auth[i]); | |
faa65f07 JL |
131 | len = sprintf(strptr, "-%u", saval); |
132 | strptr += len; | |
9409ae58 | 133 | } |
faa65f07 JL |
134 | |
135 | return sidstr; | |
9409ae58 SP |
136 | } |
137 | ||
436bb435 JL |
138 | /* |
139 | * if the two SIDs (roughly equivalent to a UUID for a user or group) are | |
140 | * the same returns zero, if they do not match returns non-zero. | |
141 | */ | |
142 | static int | |
143 | compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) | |
144 | { | |
145 | int i; | |
146 | int num_subauth, num_sat, num_saw; | |
147 | ||
148 | if ((!ctsid) || (!cwsid)) | |
149 | return 1; | |
150 | ||
151 | /* compare the revision */ | |
152 | if (ctsid->revision != cwsid->revision) { | |
153 | if (ctsid->revision > cwsid->revision) | |
154 | return 1; | |
155 | else | |
156 | return -1; | |
157 | } | |
158 | ||
159 | /* compare all of the six auth values */ | |
160 | for (i = 0; i < NUM_AUTHS; ++i) { | |
161 | if (ctsid->authority[i] != cwsid->authority[i]) { | |
162 | if (ctsid->authority[i] > cwsid->authority[i]) | |
163 | return 1; | |
164 | else | |
165 | return -1; | |
166 | } | |
167 | } | |
168 | ||
169 | /* compare all of the subauth values if any */ | |
170 | num_sat = ctsid->num_subauth; | |
171 | num_saw = cwsid->num_subauth; | |
172 | num_subauth = num_sat < num_saw ? num_sat : num_saw; | |
173 | if (num_subauth) { | |
174 | for (i = 0; i < num_subauth; ++i) { | |
175 | if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { | |
176 | if (le32_to_cpu(ctsid->sub_auth[i]) > | |
177 | le32_to_cpu(cwsid->sub_auth[i])) | |
178 | return 1; | |
179 | else | |
180 | return -1; | |
181 | } | |
182 | } | |
183 | } | |
184 | ||
185 | return 0; /* sids compare/match */ | |
186 | } | |
187 | ||
36960e44 JL |
188 | static void |
189 | cifs_copy_sid(struct cifs_sid *dst, const struct cifs_sid *src) | |
190 | { | |
36f87ee7 JL |
191 | int i; |
192 | ||
193 | dst->revision = src->revision; | |
30c9d6cc | 194 | dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES); |
36f87ee7 JL |
195 | for (i = 0; i < NUM_AUTHS; ++i) |
196 | dst->authority[i] = src->authority[i]; | |
197 | for (i = 0; i < dst->num_subauth; ++i) | |
198 | dst->sub_auth[i] = src->sub_auth[i]; | |
36960e44 JL |
199 | } |
200 | ||
9409ae58 | 201 | static int |
faa65f07 | 202 | id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) |
9409ae58 | 203 | { |
faa65f07 | 204 | int rc; |
21fed0d5 | 205 | struct key *sidkey; |
2ae03025 JL |
206 | struct cifs_sid *ksid; |
207 | unsigned int ksid_size; | |
faa65f07 | 208 | char desc[3 + 10 + 1]; /* 3 byte prefix + 10 bytes for value + NULL */ |
21fed0d5 | 209 | const struct cred *saved_cred; |
21fed0d5 | 210 | |
faa65f07 JL |
211 | rc = snprintf(desc, sizeof(desc), "%ci:%u", |
212 | sidtype == SIDOWNER ? 'o' : 'g', cid); | |
213 | if (rc >= sizeof(desc)) | |
214 | return -EINVAL; | |
21fed0d5 | 215 | |
faa65f07 JL |
216 | rc = 0; |
217 | saved_cred = override_creds(root_cred); | |
218 | sidkey = request_key(&cifs_idmap_key_type, desc, ""); | |
219 | if (IS_ERR(sidkey)) { | |
21fed0d5 | 220 | rc = -EINVAL; |
f96637be JP |
221 | cifs_dbg(FYI, "%s: Can't map %cid %u to a SID\n", |
222 | __func__, sidtype == SIDOWNER ? 'u' : 'g', cid); | |
faa65f07 JL |
223 | goto out_revert_creds; |
224 | } else if (sidkey->datalen < CIFS_SID_BASE_SIZE) { | |
225 | rc = -EIO; | |
f96637be JP |
226 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
227 | __func__, sidkey->datalen); | |
2ae03025 | 228 | goto invalidate_key; |
21fed0d5 | 229 | } |
2ae03025 | 230 | |
1f630680 JL |
231 | /* |
232 | * A sid is usually too large to be embedded in payload.value, but if | |
233 | * there are no subauthorities and the host has 8-byte pointers, then | |
234 | * it could be. | |
235 | */ | |
236 | ksid = sidkey->datalen <= sizeof(sidkey->payload) ? | |
237 | (struct cifs_sid *)&sidkey->payload.value : | |
238 | (struct cifs_sid *)sidkey->payload.data; | |
239 | ||
2ae03025 JL |
240 | ksid_size = CIFS_SID_BASE_SIZE + (ksid->num_subauth * sizeof(__le32)); |
241 | if (ksid_size > sidkey->datalen) { | |
242 | rc = -EIO; | |
f96637be JP |
243 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu, ksid_size=%u)\n", |
244 | __func__, sidkey->datalen, ksid_size); | |
2ae03025 JL |
245 | goto invalidate_key; |
246 | } | |
1f630680 | 247 | |
2ae03025 | 248 | cifs_copy_sid(ssid, ksid); |
faa65f07 JL |
249 | out_key_put: |
250 | key_put(sidkey); | |
251 | out_revert_creds: | |
252 | revert_creds(saved_cred); | |
21fed0d5 | 253 | return rc; |
2ae03025 JL |
254 | |
255 | invalidate_key: | |
256 | key_invalidate(sidkey); | |
257 | goto out_key_put; | |
21fed0d5 SP |
258 | } |
259 | ||
9409ae58 SP |
260 | static int |
261 | sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid, | |
262 | struct cifs_fattr *fattr, uint sidtype) | |
263 | { | |
264 | int rc; | |
faa65f07 JL |
265 | struct key *sidkey; |
266 | char *sidstr; | |
9409ae58 | 267 | const struct cred *saved_cred; |
8abf2775 EB |
268 | kuid_t fuid = cifs_sb->mnt_uid; |
269 | kgid_t fgid = cifs_sb->mnt_gid; | |
9409ae58 SP |
270 | |
271 | /* | |
faa65f07 JL |
272 | * If we have too many subauthorities, then something is really wrong. |
273 | * Just return an error. | |
9409ae58 | 274 | */ |
faa65f07 | 275 | if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) { |
f96637be JP |
276 | cifs_dbg(FYI, "%s: %u subauthorities is too many!\n", |
277 | __func__, psid->num_subauth); | |
faa65f07 | 278 | return -EIO; |
9409ae58 SP |
279 | } |
280 | ||
faa65f07 JL |
281 | sidstr = sid_to_key_str(psid, sidtype); |
282 | if (!sidstr) | |
283 | return -ENOMEM; | |
284 | ||
285 | saved_cred = override_creds(root_cred); | |
286 | sidkey = request_key(&cifs_idmap_key_type, sidstr, ""); | |
287 | if (IS_ERR(sidkey)) { | |
288 | rc = -EINVAL; | |
f96637be JP |
289 | cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n", |
290 | __func__, sidstr, sidtype == SIDOWNER ? 'u' : 'g'); | |
faa65f07 JL |
291 | goto out_revert_creds; |
292 | } | |
293 | ||
294 | /* | |
295 | * FIXME: Here we assume that uid_t and gid_t are same size. It's | |
296 | * probably a safe assumption but might be better to check based on | |
297 | * sidtype. | |
298 | */ | |
355958f2 | 299 | BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t)); |
41a9f1f6 | 300 | if (sidkey->datalen != sizeof(uid_t)) { |
faa65f07 | 301 | rc = -EIO; |
f96637be JP |
302 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
303 | __func__, sidkey->datalen); | |
2ae03025 | 304 | key_invalidate(sidkey); |
faa65f07 | 305 | goto out_key_put; |
9409ae58 SP |
306 | } |
307 | ||
8abf2775 EB |
308 | if (sidtype == SIDOWNER) { |
309 | kuid_t uid; | |
310 | uid_t id; | |
311 | memcpy(&id, &sidkey->payload.value, sizeof(uid_t)); | |
312 | uid = make_kuid(&init_user_ns, id); | |
313 | if (uid_valid(uid)) | |
314 | fuid = uid; | |
315 | } else { | |
316 | kgid_t gid; | |
317 | gid_t id; | |
318 | memcpy(&id, &sidkey->payload.value, sizeof(gid_t)); | |
319 | gid = make_kgid(&init_user_ns, id); | |
320 | if (gid_valid(gid)) | |
321 | fgid = gid; | |
322 | } | |
faa65f07 JL |
323 | |
324 | out_key_put: | |
325 | key_put(sidkey); | |
326 | out_revert_creds: | |
327 | revert_creds(saved_cred); | |
328 | kfree(sidstr); | |
9409ae58 | 329 | |
faa65f07 JL |
330 | /* |
331 | * Note that we return 0 here unconditionally. If the mapping | |
332 | * fails then we just fall back to using the mnt_uid/mnt_gid. | |
333 | */ | |
334 | if (sidtype == SIDOWNER) | |
335 | fattr->cf_uid = fuid; | |
336 | else | |
337 | fattr->cf_gid = fgid; | |
9409ae58 SP |
338 | return 0; |
339 | } | |
340 | ||
4d79dba0 SP |
341 | int |
342 | init_cifs_idmap(void) | |
343 | { | |
344 | struct cred *cred; | |
345 | struct key *keyring; | |
346 | int ret; | |
347 | ||
f96637be JP |
348 | cifs_dbg(FYI, "Registering the %s key type\n", |
349 | cifs_idmap_key_type.name); | |
4d79dba0 SP |
350 | |
351 | /* create an override credential set with a special thread keyring in | |
352 | * which requests are cached | |
353 | * | |
354 | * this is used to prevent malicious redirections from being installed | |
355 | * with add_key(). | |
356 | */ | |
357 | cred = prepare_kernel_cred(NULL); | |
358 | if (!cred) | |
359 | return -ENOMEM; | |
360 | ||
8e3028b9 EB |
361 | keyring = keyring_alloc(".cifs_idmap", |
362 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, | |
f8aa23a5 DH |
363 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | |
364 | KEY_USR_VIEW | KEY_USR_READ, | |
365 | KEY_ALLOC_NOT_IN_QUOTA, NULL); | |
4d79dba0 SP |
366 | if (IS_ERR(keyring)) { |
367 | ret = PTR_ERR(keyring); | |
368 | goto failed_put_cred; | |
369 | } | |
370 | ||
4d79dba0 SP |
371 | ret = register_key_type(&cifs_idmap_key_type); |
372 | if (ret < 0) | |
373 | goto failed_put_key; | |
374 | ||
375 | /* instruct request_key() to use this special keyring as a cache for | |
376 | * the results it looks up */ | |
700920eb | 377 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
4d79dba0 SP |
378 | cred->thread_keyring = keyring; |
379 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
380 | root_cred = cred; | |
381 | ||
f96637be | 382 | cifs_dbg(FYI, "cifs idmap keyring: %d\n", key_serial(keyring)); |
4d79dba0 SP |
383 | return 0; |
384 | ||
385 | failed_put_key: | |
386 | key_put(keyring); | |
387 | failed_put_cred: | |
388 | put_cred(cred); | |
389 | return ret; | |
390 | } | |
391 | ||
392 | void | |
393 | exit_cifs_idmap(void) | |
394 | { | |
395 | key_revoke(root_cred->thread_keyring); | |
396 | unregister_key_type(&cifs_idmap_key_type); | |
397 | put_cred(root_cred); | |
f96637be | 398 | cifs_dbg(FYI, "Unregistered %s key type\n", cifs_idmap_key_type.name); |
4d79dba0 SP |
399 | } |
400 | ||
97837582 SF |
401 | /* copy ntsd, owner sid, and group sid from a security descriptor to another */ |
402 | static void copy_sec_desc(const struct cifs_ntsd *pntsd, | |
403 | struct cifs_ntsd *pnntsd, __u32 sidsoffset) | |
404 | { | |
97837582 SF |
405 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
406 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; | |
407 | ||
408 | /* copy security descriptor control portion */ | |
409 | pnntsd->revision = pntsd->revision; | |
410 | pnntsd->type = pntsd->type; | |
411 | pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); | |
412 | pnntsd->sacloffset = 0; | |
413 | pnntsd->osidoffset = cpu_to_le32(sidsoffset); | |
414 | pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); | |
415 | ||
416 | /* copy owner sid */ | |
417 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
418 | le32_to_cpu(pntsd->osidoffset)); | |
419 | nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); | |
36960e44 | 420 | cifs_copy_sid(nowner_sid_ptr, owner_sid_ptr); |
97837582 SF |
421 | |
422 | /* copy group sid */ | |
423 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
424 | le32_to_cpu(pntsd->gsidoffset)); | |
425 | ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + | |
426 | sizeof(struct cifs_sid)); | |
36960e44 | 427 | cifs_copy_sid(ngroup_sid_ptr, group_sid_ptr); |
97837582 SF |
428 | |
429 | return; | |
430 | } | |
431 | ||
432 | ||
630f3f0c SF |
433 | /* |
434 | change posix mode to reflect permissions | |
435 | pmode is the existing mode (we only want to overwrite part of this | |
436 | bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 | |
437 | */ | |
9b5e6857 | 438 | static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
15b03959 | 439 | umode_t *pbits_to_set) |
630f3f0c | 440 | { |
9b5e6857 | 441 | __u32 flags = le32_to_cpu(ace_flags); |
15b03959 | 442 | /* the order of ACEs is important. The canonical order is to begin with |
ce06c9f0 | 443 | DENY entries followed by ALLOW, otherwise an allow entry could be |
15b03959 | 444 | encountered first, making the subsequent deny entry like "dead code" |
ce06c9f0 | 445 | which would be superflous since Windows stops when a match is made |
15b03959 SF |
446 | for the operation you are trying to perform for your user */ |
447 | ||
448 | /* For deny ACEs we change the mask so that subsequent allow access | |
449 | control entries do not turn on the bits we are denying */ | |
450 | if (type == ACCESS_DENIED) { | |
ad7a2926 | 451 | if (flags & GENERIC_ALL) |
15b03959 | 452 | *pbits_to_set &= ~S_IRWXUGO; |
ad7a2926 | 453 | |
9b5e6857 AV |
454 | if ((flags & GENERIC_WRITE) || |
455 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 456 | *pbits_to_set &= ~S_IWUGO; |
9b5e6857 AV |
457 | if ((flags & GENERIC_READ) || |
458 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 459 | *pbits_to_set &= ~S_IRUGO; |
9b5e6857 AV |
460 | if ((flags & GENERIC_EXECUTE) || |
461 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 SF |
462 | *pbits_to_set &= ~S_IXUGO; |
463 | return; | |
464 | } else if (type != ACCESS_ALLOWED) { | |
f96637be | 465 | cifs_dbg(VFS, "unknown access control type %d\n", type); |
15b03959 SF |
466 | return; |
467 | } | |
468 | /* else ACCESS_ALLOWED type */ | |
630f3f0c | 469 | |
9b5e6857 | 470 | if (flags & GENERIC_ALL) { |
15b03959 | 471 | *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
f96637be | 472 | cifs_dbg(NOISY, "all perms\n"); |
d61e5808 SF |
473 | return; |
474 | } | |
9b5e6857 AV |
475 | if ((flags & GENERIC_WRITE) || |
476 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 477 | *pmode |= (S_IWUGO & (*pbits_to_set)); |
9b5e6857 AV |
478 | if ((flags & GENERIC_READ) || |
479 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 480 | *pmode |= (S_IRUGO & (*pbits_to_set)); |
9b5e6857 AV |
481 | if ((flags & GENERIC_EXECUTE) || |
482 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 | 483 | *pmode |= (S_IXUGO & (*pbits_to_set)); |
630f3f0c | 484 | |
f96637be | 485 | cifs_dbg(NOISY, "access flags 0x%x mode now 0x%x\n", flags, *pmode); |
630f3f0c SF |
486 | return; |
487 | } | |
488 | ||
ce06c9f0 SF |
489 | /* |
490 | Generate access flags to reflect permissions mode is the existing mode. | |
491 | This function is called for every ACE in the DACL whose SID matches | |
492 | with either owner or group or everyone. | |
493 | */ | |
494 | ||
495 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, | |
496 | __u32 *pace_flags) | |
497 | { | |
498 | /* reset access mask */ | |
499 | *pace_flags = 0x0; | |
500 | ||
501 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ | |
502 | mode &= bits_to_use; | |
503 | ||
504 | /* check for R/W/X UGO since we do not know whose flags | |
505 | is this but we have cleared all the bits sans RWX for | |
506 | either user or group or other as per bits_to_use */ | |
507 | if (mode & S_IRUGO) | |
508 | *pace_flags |= SET_FILE_READ_RIGHTS; | |
509 | if (mode & S_IWUGO) | |
510 | *pace_flags |= SET_FILE_WRITE_RIGHTS; | |
511 | if (mode & S_IXUGO) | |
512 | *pace_flags |= SET_FILE_EXEC_RIGHTS; | |
513 | ||
f96637be JP |
514 | cifs_dbg(NOISY, "mode: 0x%x, access flags now 0x%x\n", |
515 | mode, *pace_flags); | |
ce06c9f0 SF |
516 | return; |
517 | } | |
518 | ||
2b210adc | 519 | static __u16 fill_ace_for_sid(struct cifs_ace *pntace, |
97837582 SF |
520 | const struct cifs_sid *psid, __u64 nmode, umode_t bits) |
521 | { | |
522 | int i; | |
523 | __u16 size = 0; | |
524 | __u32 access_req = 0; | |
525 | ||
526 | pntace->type = ACCESS_ALLOWED; | |
527 | pntace->flags = 0x0; | |
528 | mode_to_access_flags(nmode, bits, &access_req); | |
529 | if (!access_req) | |
530 | access_req = SET_MINIMUM_RIGHTS; | |
531 | pntace->access_req = cpu_to_le32(access_req); | |
532 | ||
533 | pntace->sid.revision = psid->revision; | |
534 | pntace->sid.num_subauth = psid->num_subauth; | |
852e2295 | 535 | for (i = 0; i < NUM_AUTHS; i++) |
97837582 SF |
536 | pntace->sid.authority[i] = psid->authority[i]; |
537 | for (i = 0; i < psid->num_subauth; i++) | |
538 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; | |
539 | ||
540 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); | |
541 | pntace->size = cpu_to_le16(size); | |
542 | ||
ef571cad | 543 | return size; |
97837582 SF |
544 | } |
545 | ||
297647c2 | 546 | |
953f8681 SF |
547 | #ifdef CONFIG_CIFS_DEBUG2 |
548 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) | |
d0d66c44 | 549 | { |
d0d66c44 | 550 | int num_subauth; |
d0d66c44 SP |
551 | |
552 | /* validate that we do not go past end of acl */ | |
297647c2 | 553 | |
44093ca2 | 554 | if (le16_to_cpu(pace->size) < 16) { |
f96637be | 555 | cifs_dbg(VFS, "ACE too small %d\n", le16_to_cpu(pace->size)); |
44093ca2 SF |
556 | return; |
557 | } | |
558 | ||
559 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
f96637be | 560 | cifs_dbg(VFS, "ACL too small to parse ACE\n"); |
d0d66c44 | 561 | return; |
44093ca2 | 562 | } |
d0d66c44 | 563 | |
44093ca2 | 564 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 565 | if (num_subauth) { |
8f18c131 | 566 | int i; |
f96637be JP |
567 | cifs_dbg(FYI, "ACE revision %d num_auth %d type %d flags %d size %d\n", |
568 | pace->sid.revision, pace->sid.num_subauth, pace->type, | |
569 | pace->flags, le16_to_cpu(pace->size)); | |
d12fd121 | 570 | for (i = 0; i < num_subauth; ++i) { |
f96637be JP |
571 | cifs_dbg(FYI, "ACE sub_auth[%d]: 0x%x\n", |
572 | i, le32_to_cpu(pace->sid.sub_auth[i])); | |
d12fd121 SF |
573 | } |
574 | ||
575 | /* BB add length check to make sure that we do not have huge | |
576 | num auths and therefore go off the end */ | |
d12fd121 SF |
577 | } |
578 | ||
579 | return; | |
580 | } | |
953f8681 | 581 | #endif |
d12fd121 | 582 | |
d0d66c44 | 583 | |
a750e77c | 584 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 585 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
0b8f18e3 | 586 | struct cifs_fattr *fattr) |
d0d66c44 SP |
587 | { |
588 | int i; | |
589 | int num_aces = 0; | |
590 | int acl_size; | |
591 | char *acl_base; | |
d0d66c44 SP |
592 | struct cifs_ace **ppace; |
593 | ||
594 | /* BB need to add parm so we can store the SID BB */ | |
595 | ||
2b83457b SF |
596 | if (!pdacl) { |
597 | /* no DACL in the security descriptor, set | |
598 | all the permissions for user/group/other */ | |
0b8f18e3 | 599 | fattr->cf_mode |= S_IRWXUGO; |
2b83457b SF |
600 | return; |
601 | } | |
602 | ||
d0d66c44 | 603 | /* validate that we do not go past end of acl */ |
af6f4612 | 604 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
f96637be | 605 | cifs_dbg(VFS, "ACL too small to parse DACL\n"); |
d0d66c44 SP |
606 | return; |
607 | } | |
608 | ||
f96637be JP |
609 | cifs_dbg(NOISY, "DACL revision %d size %d num aces %d\n", |
610 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), | |
611 | le32_to_cpu(pdacl->num_aces)); | |
d0d66c44 | 612 | |
7505e052 SF |
613 | /* reset rwx permissions for user/group/other. |
614 | Also, if num_aces is 0 i.e. DACL has no ACEs, | |
615 | user/group/other have no permissions */ | |
0b8f18e3 | 616 | fattr->cf_mode &= ~(S_IRWXUGO); |
7505e052 | 617 | |
d0d66c44 SP |
618 | acl_base = (char *)pdacl; |
619 | acl_size = sizeof(struct cifs_acl); | |
620 | ||
adbc0358 | 621 | num_aces = le32_to_cpu(pdacl->num_aces); |
a5ff3769 | 622 | if (num_aces > 0) { |
15b03959 SF |
623 | umode_t user_mask = S_IRWXU; |
624 | umode_t group_mask = S_IRWXG; | |
2fbc2f17 | 625 | umode_t other_mask = S_IRWXU | S_IRWXG | S_IRWXO; |
15b03959 | 626 | |
7250170c DC |
627 | if (num_aces > ULONG_MAX / sizeof(struct cifs_ace *)) |
628 | return; | |
d0d66c44 SP |
629 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
630 | GFP_KERNEL); | |
f96637be | 631 | if (!ppace) |
8132b65b | 632 | return; |
d0d66c44 | 633 | |
d0d66c44 | 634 | for (i = 0; i < num_aces; ++i) { |
44093ca2 | 635 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
953f8681 SF |
636 | #ifdef CONFIG_CIFS_DEBUG2 |
637 | dump_ace(ppace[i], end_of_acl); | |
638 | #endif | |
9409ae58 | 639 | if (compare_sids(&(ppace[i]->sid), pownersid) == 0) |
e01b6400 | 640 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 641 | ppace[i]->type, |
0b8f18e3 | 642 | &fattr->cf_mode, |
15b03959 | 643 | &user_mask); |
9409ae58 | 644 | if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0) |
e01b6400 | 645 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 646 | ppace[i]->type, |
0b8f18e3 | 647 | &fattr->cf_mode, |
15b03959 | 648 | &group_mask); |
9409ae58 | 649 | if (compare_sids(&(ppace[i]->sid), &sid_everyone) == 0) |
e01b6400 | 650 | access_flags_to_mode(ppace[i]->access_req, |
15b03959 | 651 | ppace[i]->type, |
0b8f18e3 | 652 | &fattr->cf_mode, |
15b03959 | 653 | &other_mask); |
9409ae58 | 654 | if (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0) |
2fbc2f17 SP |
655 | access_flags_to_mode(ppace[i]->access_req, |
656 | ppace[i]->type, | |
657 | &fattr->cf_mode, | |
658 | &other_mask); | |
659 | ||
e01b6400 | 660 | |
44093ca2 | 661 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
662 | (void *)ppace[i], |
663 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 664 | |
44093ca2 SF |
665 | acl_base = (char *)ppace[i]; |
666 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
667 | } |
668 | ||
669 | kfree(ppace); | |
d0d66c44 SP |
670 | } |
671 | ||
672 | return; | |
673 | } | |
674 | ||
bcb02034 | 675 | |
97837582 SF |
676 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
677 | struct cifs_sid *pgrpsid, __u64 nmode) | |
678 | { | |
2b210adc | 679 | u16 size = 0; |
97837582 SF |
680 | struct cifs_acl *pnndacl; |
681 | ||
682 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); | |
683 | ||
684 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), | |
685 | pownersid, nmode, S_IRWXU); | |
686 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
687 | pgrpsid, nmode, S_IRWXG); | |
688 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
689 | &sid_everyone, nmode, S_IRWXO); | |
690 | ||
691 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); | |
d9f382ef | 692 | pndacl->num_aces = cpu_to_le32(3); |
97837582 | 693 | |
ef571cad | 694 | return 0; |
97837582 SF |
695 | } |
696 | ||
697 | ||
bcb02034 SF |
698 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
699 | { | |
700 | /* BB need to add parm so we can store the SID BB */ | |
701 | ||
b9c7a2bb SF |
702 | /* validate that we do not go past end of ACL - sid must be at least 8 |
703 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
704 | if (end_of_acl < (char *)psid + 8) { | |
f96637be | 705 | cifs_dbg(VFS, "ACL too small to parse SID %p\n", psid); |
bcb02034 SF |
706 | return -EINVAL; |
707 | } | |
d0d66c44 | 708 | |
bcb02034 | 709 | #ifdef CONFIG_CIFS_DEBUG2 |
fc03d8a5 | 710 | if (psid->num_subauth) { |
8f18c131 | 711 | int i; |
f96637be JP |
712 | cifs_dbg(FYI, "SID revision %d num_auth %d\n", |
713 | psid->revision, psid->num_subauth); | |
bcb02034 | 714 | |
af6f4612 | 715 | for (i = 0; i < psid->num_subauth; i++) { |
f96637be JP |
716 | cifs_dbg(FYI, "SID sub_auth[%d]: 0x%x\n", |
717 | i, le32_to_cpu(psid->sub_auth[i])); | |
d0d66c44 SP |
718 | } |
719 | ||
d12fd121 | 720 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 721 | num auths and therefore go off the end */ |
f96637be JP |
722 | cifs_dbg(FYI, "RID 0x%x\n", |
723 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1])); | |
d0d66c44 | 724 | } |
fc03d8a5 | 725 | #endif |
d0d66c44 | 726 | |
bcb02034 SF |
727 | return 0; |
728 | } | |
729 | ||
d0d66c44 | 730 | |
bcb02034 | 731 | /* Convert CIFS ACL to POSIX form */ |
9409ae58 SP |
732 | static int parse_sec_desc(struct cifs_sb_info *cifs_sb, |
733 | struct cifs_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr) | |
bcb02034 | 734 | { |
9409ae58 | 735 | int rc = 0; |
bcb02034 SF |
736 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
737 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 | 738 | char *end_of_acl = ((char *)pntsd) + acl_len; |
7505e052 | 739 | __u32 dacloffset; |
bcb02034 | 740 | |
0b8f18e3 | 741 | if (pntsd == NULL) |
b9c7a2bb SF |
742 | return -EIO; |
743 | ||
bcb02034 | 744 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 745 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 746 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 747 | le32_to_cpu(pntsd->gsidoffset)); |
7505e052 | 748 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
63d2583f | 749 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
f96637be | 750 | cifs_dbg(NOISY, "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n", |
af6f4612 SF |
751 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
752 | le32_to_cpu(pntsd->gsidoffset), | |
b6b38f70 | 753 | le32_to_cpu(pntsd->sacloffset), dacloffset); |
b9c7a2bb | 754 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 | 755 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
9409ae58 | 756 | if (rc) { |
f96637be | 757 | cifs_dbg(FYI, "%s: Error %d parsing Owner SID\n", __func__, rc); |
9409ae58 SP |
758 | return rc; |
759 | } | |
760 | rc = sid_to_id(cifs_sb, owner_sid_ptr, fattr, SIDOWNER); | |
761 | if (rc) { | |
f96637be JP |
762 | cifs_dbg(FYI, "%s: Error %d mapping Owner SID to uid\n", |
763 | __func__, rc); | |
bcb02034 | 764 | return rc; |
9409ae58 | 765 | } |
bcb02034 SF |
766 | |
767 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
9409ae58 | 768 | if (rc) { |
f96637be JP |
769 | cifs_dbg(FYI, "%s: Error %d mapping Owner SID to gid\n", |
770 | __func__, rc); | |
bcb02034 | 771 | return rc; |
9409ae58 SP |
772 | } |
773 | rc = sid_to_id(cifs_sb, group_sid_ptr, fattr, SIDGROUP); | |
774 | if (rc) { | |
f96637be JP |
775 | cifs_dbg(FYI, "%s: Error %d mapping Group SID to gid\n", |
776 | __func__, rc); | |
9409ae58 SP |
777 | return rc; |
778 | } | |
bcb02034 | 779 | |
7505e052 SF |
780 | if (dacloffset) |
781 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, | |
0b8f18e3 | 782 | group_sid_ptr, fattr); |
7505e052 | 783 | else |
f96637be | 784 | cifs_dbg(FYI, "no ACL\n"); /* BB grant all or default perms? */ |
d0d66c44 | 785 | |
9409ae58 | 786 | return rc; |
bcb02034 | 787 | } |
b9c7a2bb | 788 | |
97837582 SF |
789 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
790 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, | |
8abf2775 | 791 | __u32 secdesclen, __u64 nmode, kuid_t uid, kgid_t gid, int *aclflag) |
97837582 SF |
792 | { |
793 | int rc = 0; | |
794 | __u32 dacloffset; | |
795 | __u32 ndacloffset; | |
796 | __u32 sidsoffset; | |
797 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
a5ff3769 | 798 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
97837582 SF |
799 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ |
800 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ | |
801 | ||
a5ff3769 SP |
802 | if (nmode != NO_CHANGE_64) { /* chmod */ |
803 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
97837582 | 804 | le32_to_cpu(pntsd->osidoffset)); |
a5ff3769 | 805 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
97837582 | 806 | le32_to_cpu(pntsd->gsidoffset)); |
a5ff3769 SP |
807 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
808 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); | |
809 | ndacloffset = sizeof(struct cifs_ntsd); | |
810 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); | |
811 | ndacl_ptr->revision = dacl_ptr->revision; | |
812 | ndacl_ptr->size = 0; | |
813 | ndacl_ptr->num_aces = 0; | |
814 | ||
815 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, | |
816 | nmode); | |
817 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); | |
818 | /* copy sec desc control portion & owner and group sids */ | |
819 | copy_sec_desc(pntsd, pnntsd, sidsoffset); | |
820 | *aclflag = CIFS_ACL_DACL; | |
821 | } else { | |
822 | memcpy(pnntsd, pntsd, secdesclen); | |
8abf2775 EB |
823 | if (uid_valid(uid)) { /* chown */ |
824 | uid_t id; | |
a5ff3769 SP |
825 | owner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
826 | le32_to_cpu(pnntsd->osidoffset)); | |
827 | nowner_sid_ptr = kmalloc(sizeof(struct cifs_sid), | |
828 | GFP_KERNEL); | |
829 | if (!nowner_sid_ptr) | |
830 | return -ENOMEM; | |
8abf2775 EB |
831 | id = from_kuid(&init_user_ns, uid); |
832 | rc = id_to_sid(id, SIDOWNER, nowner_sid_ptr); | |
a5ff3769 | 833 | if (rc) { |
f96637be JP |
834 | cifs_dbg(FYI, "%s: Mapping error %d for owner id %d\n", |
835 | __func__, rc, id); | |
a5ff3769 SP |
836 | kfree(nowner_sid_ptr); |
837 | return rc; | |
838 | } | |
36960e44 | 839 | cifs_copy_sid(owner_sid_ptr, nowner_sid_ptr); |
a5ff3769 SP |
840 | kfree(nowner_sid_ptr); |
841 | *aclflag = CIFS_ACL_OWNER; | |
842 | } | |
8abf2775 EB |
843 | if (gid_valid(gid)) { /* chgrp */ |
844 | gid_t id; | |
a5ff3769 SP |
845 | group_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
846 | le32_to_cpu(pnntsd->gsidoffset)); | |
847 | ngroup_sid_ptr = kmalloc(sizeof(struct cifs_sid), | |
848 | GFP_KERNEL); | |
849 | if (!ngroup_sid_ptr) | |
850 | return -ENOMEM; | |
8abf2775 EB |
851 | id = from_kgid(&init_user_ns, gid); |
852 | rc = id_to_sid(id, SIDGROUP, ngroup_sid_ptr); | |
a5ff3769 | 853 | if (rc) { |
f96637be JP |
854 | cifs_dbg(FYI, "%s: Mapping error %d for group id %d\n", |
855 | __func__, rc, id); | |
a5ff3769 SP |
856 | kfree(ngroup_sid_ptr); |
857 | return rc; | |
858 | } | |
36960e44 | 859 | cifs_copy_sid(group_sid_ptr, ngroup_sid_ptr); |
a5ff3769 SP |
860 | kfree(ngroup_sid_ptr); |
861 | *aclflag = CIFS_ACL_GROUP; | |
862 | } | |
863 | } | |
97837582 | 864 | |
ef571cad | 865 | return rc; |
97837582 SF |
866 | } |
867 | ||
1bf4072d CH |
868 | static struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, |
869 | __u16 fid, u32 *pacllen) | |
b9c7a2bb | 870 | { |
b9c7a2bb | 871 | struct cifs_ntsd *pntsd = NULL; |
6d5786a3 PS |
872 | unsigned int xid; |
873 | int rc; | |
7ffec372 JL |
874 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
875 | ||
876 | if (IS_ERR(tlink)) | |
987b21d7 | 877 | return ERR_CAST(tlink); |
b9c7a2bb | 878 | |
6d5786a3 | 879 | xid = get_xid(); |
7ffec372 | 880 | rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), fid, &pntsd, 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; | |
1bf4072d | 898 | __u16 fid; |
96daf2b0 | 899 | struct cifs_tcon *tcon; |
7ffec372 JL |
900 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
901 | ||
902 | if (IS_ERR(tlink)) | |
987b21d7 | 903 | return ERR_CAST(tlink); |
b9c7a2bb | 904 | |
7ffec372 | 905 | tcon = tlink_tcon(tlink); |
6d5786a3 | 906 | xid = get_xid(); |
1bf4072d | 907 | |
3d3ea8e6 SP |
908 | if (backup_cred(cifs_sb)) |
909 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
910 | ||
911 | rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, READ_CONTROL, | |
912 | create_options, &fid, &oplock, NULL, cifs_sb->local_nls, | |
913 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
987b21d7 SP |
914 | if (!rc) { |
915 | rc = CIFSSMBGetCIFSACL(xid, tcon, fid, &pntsd, pacllen); | |
916 | CIFSSMBClose(xid, tcon, fid); | |
b9c7a2bb SF |
917 | } |
918 | ||
7ffec372 | 919 | cifs_put_tlink(tlink); |
6d5786a3 | 920 | free_xid(xid); |
987b21d7 | 921 | |
f96637be | 922 | cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
987b21d7 SP |
923 | if (rc) |
924 | return ERR_PTR(rc); | |
7505e052 SF |
925 | return pntsd; |
926 | } | |
927 | ||
1bf4072d | 928 | /* Retrieve an ACL from the server */ |
fbeba8bb | 929 | struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb, |
1bf4072d CH |
930 | struct inode *inode, const char *path, |
931 | u32 *pacllen) | |
932 | { | |
933 | struct cifs_ntsd *pntsd = NULL; | |
934 | struct cifsFileInfo *open_file = NULL; | |
935 | ||
936 | if (inode) | |
6508d904 | 937 | open_file = find_readable_file(CIFS_I(inode), true); |
1bf4072d CH |
938 | if (!open_file) |
939 | return get_cifs_acl_by_path(cifs_sb, path, pacllen); | |
940 | ||
4b4de76e | 941 | pntsd = get_cifs_acl_by_fid(cifs_sb, open_file->fid.netfid, pacllen); |
6ab409b5 | 942 | cifsFileInfo_put(open_file); |
1bf4072d CH |
943 | return pntsd; |
944 | } | |
945 | ||
a5ff3769 SP |
946 | /* Set an ACL on the server */ |
947 | int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, | |
948 | struct inode *inode, const char *path, int aclflag) | |
b96d31a6 CH |
949 | { |
950 | int oplock = 0; | |
6d5786a3 PS |
951 | unsigned int xid; |
952 | int rc, access_flags, create_options = 0; | |
b96d31a6 | 953 | __u16 fid; |
96daf2b0 | 954 | struct cifs_tcon *tcon; |
a5ff3769 | 955 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
7ffec372 | 956 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
97837582 | 957 | |
7ffec372 JL |
958 | if (IS_ERR(tlink)) |
959 | return PTR_ERR(tlink); | |
960 | ||
961 | tcon = tlink_tcon(tlink); | |
6d5786a3 | 962 | xid = get_xid(); |
97837582 | 963 | |
3d3ea8e6 SP |
964 | if (backup_cred(cifs_sb)) |
965 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
966 | ||
a5ff3769 SP |
967 | if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP) |
968 | access_flags = WRITE_OWNER; | |
969 | else | |
970 | access_flags = WRITE_DAC; | |
971 | ||
972 | rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, access_flags, | |
973 | create_options, &fid, &oplock, NULL, cifs_sb->local_nls, | |
974 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
b96d31a6 | 975 | if (rc) { |
f96637be | 976 | cifs_dbg(VFS, "Unable to open file to set ACL\n"); |
b96d31a6 | 977 | goto out; |
97837582 SF |
978 | } |
979 | ||
a5ff3769 | 980 | rc = CIFSSMBSetCIFSACL(xid, tcon, fid, pnntsd, acllen, aclflag); |
f96637be | 981 | cifs_dbg(NOISY, "SetCIFSACL rc = %d\n", rc); |
97837582 | 982 | |
7ffec372 JL |
983 | CIFSSMBClose(xid, tcon, fid); |
984 | out: | |
6d5786a3 | 985 | free_xid(xid); |
7ffec372 | 986 | cifs_put_tlink(tlink); |
b96d31a6 CH |
987 | return rc; |
988 | } | |
97837582 | 989 | |
7505e052 | 990 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ |
987b21d7 | 991 | int |
0b8f18e3 JL |
992 | cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, |
993 | struct inode *inode, const char *path, const __u16 *pfid) | |
7505e052 SF |
994 | { |
995 | struct cifs_ntsd *pntsd = NULL; | |
996 | u32 acllen = 0; | |
997 | int rc = 0; | |
998 | ||
f96637be | 999 | cifs_dbg(NOISY, "converting ACL to mode for %s\n", path); |
1bf4072d CH |
1000 | |
1001 | if (pfid) | |
1002 | pntsd = get_cifs_acl_by_fid(cifs_sb, *pfid, &acllen); | |
1003 | else | |
1004 | pntsd = get_cifs_acl(cifs_sb, inode, path, &acllen); | |
7505e052 SF |
1005 | |
1006 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ | |
987b21d7 SP |
1007 | if (IS_ERR(pntsd)) { |
1008 | rc = PTR_ERR(pntsd); | |
f96637be | 1009 | cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
987b21d7 | 1010 | } else { |
9409ae58 | 1011 | rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr); |
987b21d7 SP |
1012 | kfree(pntsd); |
1013 | if (rc) | |
f96637be | 1014 | cifs_dbg(VFS, "parse sec desc failed rc = %d\n", rc); |
987b21d7 | 1015 | } |
7505e052 | 1016 | |
987b21d7 | 1017 | return rc; |
b9c7a2bb | 1018 | } |
953f8681 | 1019 | |
7505e052 | 1020 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
a5ff3769 SP |
1021 | int |
1022 | id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode, | |
8abf2775 | 1023 | kuid_t uid, kgid_t gid) |
953f8681 SF |
1024 | { |
1025 | int rc = 0; | |
a5ff3769 | 1026 | int aclflag = CIFS_ACL_DACL; /* default flag to set */ |
cce246ee | 1027 | __u32 secdesclen = 0; |
97837582 SF |
1028 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
1029 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ | |
953f8681 | 1030 | |
f96637be | 1031 | cifs_dbg(NOISY, "set ACL from mode for %s\n", path); |
953f8681 SF |
1032 | |
1033 | /* Get the security descriptor */ | |
1bf4072d | 1034 | pntsd = get_cifs_acl(CIFS_SB(inode->i_sb), inode, path, &secdesclen); |
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); |
c78cd838 JL |
1038 | goto out; |
1039 | } | |
7505e052 | 1040 | |
c78cd838 JL |
1041 | /* |
1042 | * Add three ACEs for owner, group, everyone getting rid of other ACEs | |
1043 | * as chmod disables ACEs and set the security descriptor. Allocate | |
1044 | * memory for the smb header, set security descriptor request security | |
1045 | * descriptor parameters, and secuirty descriptor itself | |
1046 | */ | |
7ee0b4c6 | 1047 | secdesclen = max_t(u32, secdesclen, DEFAULT_SEC_DESC_LEN); |
c78cd838 JL |
1048 | pnntsd = kmalloc(secdesclen, GFP_KERNEL); |
1049 | if (!pnntsd) { | |
c78cd838 JL |
1050 | kfree(pntsd); |
1051 | return -ENOMEM; | |
1052 | } | |
97837582 | 1053 | |
c78cd838 JL |
1054 | rc = build_sec_desc(pntsd, pnntsd, secdesclen, nmode, uid, gid, |
1055 | &aclflag); | |
97837582 | 1056 | |
f96637be | 1057 | cifs_dbg(NOISY, "build_sec_desc rc: %d\n", rc); |
97837582 | 1058 | |
c78cd838 JL |
1059 | if (!rc) { |
1060 | /* Set the security descriptor */ | |
1061 | rc = set_cifs_acl(pnntsd, secdesclen, inode, path, aclflag); | |
f96637be | 1062 | cifs_dbg(NOISY, "set_cifs_acl rc: %d\n", rc); |
97837582 SF |
1063 | } |
1064 | ||
c78cd838 JL |
1065 | kfree(pnntsd); |
1066 | kfree(pntsd); | |
1067 | out: | |
ef571cad | 1068 | return rc; |
953f8681 | 1069 | } |