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bcb02034 SF |
1 | /* |
2 | * fs/cifs/cifsacl.c | |
3 | * | |
4 | * Copyright (C) International Business Machines Corp., 2007 | |
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 SF |
24 | #include <linux/fs.h> |
25 | #include "cifspdu.h" | |
26 | #include "cifsglob.h" | |
d0d66c44 | 27 | #include "cifsacl.h" |
65874007 SF |
28 | #include "cifsproto.h" |
29 | #include "cifs_debug.h" | |
65874007 | 30 | |
297647c2 SF |
31 | |
32 | #ifdef CONFIG_CIFS_EXPERIMENTAL | |
33 | ||
af6f4612 | 34 | static struct cifs_wksid wksidarr[NUM_WK_SIDS] = { |
297647c2 SF |
35 | {{1, 0, {0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0} }, "null user"}, |
36 | {{1, 1, {0, 0, 0, 0, 0, 1}, {0, 0, 0, 0, 0} }, "nobody"}, | |
ce51ae14 DK |
37 | {{1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11), 0, 0, 0, 0} }, "net-users"}, |
38 | {{1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(18), 0, 0, 0, 0} }, "sys"}, | |
39 | {{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(544), 0, 0, 0} }, "root"}, | |
40 | {{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(545), 0, 0, 0} }, "users"}, | |
44093ca2 SF |
41 | {{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(546), 0, 0, 0} }, "guest"} } |
42 | ; | |
297647c2 SF |
43 | |
44 | ||
bcb02034 | 45 | /* security id for everyone */ |
e01b6400 SP |
46 | static const struct cifs_sid sid_everyone = { |
47 | 1, 1, {0, 0, 0, 0, 0, 1}, {0} }; | |
bcb02034 | 48 | /* group users */ |
ad7a2926 | 49 | static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} }; |
d0d66c44 | 50 | |
297647c2 SF |
51 | |
52 | int match_sid(struct cifs_sid *ctsid) | |
53 | { | |
54 | int i, j; | |
55 | int num_subauth, num_sat, num_saw; | |
56 | struct cifs_sid *cwsid; | |
57 | ||
58 | if (!ctsid) | |
59 | return (-1); | |
60 | ||
61 | for (i = 0; i < NUM_WK_SIDS; ++i) { | |
62 | cwsid = &(wksidarr[i].cifssid); | |
63 | ||
64 | /* compare the revision */ | |
65 | if (ctsid->revision != cwsid->revision) | |
66 | continue; | |
67 | ||
68 | /* compare all of the six auth values */ | |
69 | for (j = 0; j < 6; ++j) { | |
70 | if (ctsid->authority[j] != cwsid->authority[j]) | |
71 | break; | |
72 | } | |
73 | if (j < 6) | |
74 | continue; /* all of the auth values did not match */ | |
75 | ||
76 | /* compare all of the subauth values if any */ | |
ce51ae14 DK |
77 | num_sat = ctsid->num_subauth; |
78 | num_saw = cwsid->num_subauth; | |
297647c2 SF |
79 | num_subauth = num_sat < num_saw ? num_sat : num_saw; |
80 | if (num_subauth) { | |
81 | for (j = 0; j < num_subauth; ++j) { | |
82 | if (ctsid->sub_auth[j] != cwsid->sub_auth[j]) | |
83 | break; | |
84 | } | |
85 | if (j < num_subauth) | |
86 | continue; /* all sub_auth values do not match */ | |
87 | } | |
88 | ||
89 | cFYI(1, ("matching sid: %s\n", wksidarr[i].sidname)); | |
90 | return (0); /* sids compare/match */ | |
91 | } | |
92 | ||
93 | cFYI(1, ("No matching sid")); | |
94 | return (-1); | |
95 | } | |
96 | ||
a750e77c SF |
97 | /* if the two SIDs (roughly equivalent to a UUID for a user or group) are |
98 | the same returns 1, if they do not match returns 0 */ | |
630f3f0c | 99 | int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) |
297647c2 SF |
100 | { |
101 | int i; | |
102 | int num_subauth, num_sat, num_saw; | |
103 | ||
104 | if ((!ctsid) || (!cwsid)) | |
a750e77c | 105 | return (0); |
297647c2 SF |
106 | |
107 | /* compare the revision */ | |
108 | if (ctsid->revision != cwsid->revision) | |
a750e77c | 109 | return (0); |
297647c2 SF |
110 | |
111 | /* compare all of the six auth values */ | |
112 | for (i = 0; i < 6; ++i) { | |
113 | if (ctsid->authority[i] != cwsid->authority[i]) | |
a750e77c | 114 | return (0); |
297647c2 SF |
115 | } |
116 | ||
117 | /* compare all of the subauth values if any */ | |
adbc0358 | 118 | num_sat = ctsid->num_subauth; |
adddd49d | 119 | num_saw = cwsid->num_subauth; |
297647c2 SF |
120 | num_subauth = num_sat < num_saw ? num_sat : num_saw; |
121 | if (num_subauth) { | |
122 | for (i = 0; i < num_subauth; ++i) { | |
123 | if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) | |
a750e77c | 124 | return (0); |
297647c2 SF |
125 | } |
126 | } | |
127 | ||
a750e77c | 128 | return (1); /* sids compare/match */ |
297647c2 SF |
129 | } |
130 | ||
97837582 SF |
131 | |
132 | /* copy ntsd, owner sid, and group sid from a security descriptor to another */ | |
133 | static void copy_sec_desc(const struct cifs_ntsd *pntsd, | |
134 | struct cifs_ntsd *pnntsd, __u32 sidsoffset) | |
135 | { | |
136 | int i; | |
137 | ||
138 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
139 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; | |
140 | ||
141 | /* copy security descriptor control portion */ | |
142 | pnntsd->revision = pntsd->revision; | |
143 | pnntsd->type = pntsd->type; | |
144 | pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); | |
145 | pnntsd->sacloffset = 0; | |
146 | pnntsd->osidoffset = cpu_to_le32(sidsoffset); | |
147 | pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); | |
148 | ||
149 | /* copy owner sid */ | |
150 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
151 | le32_to_cpu(pntsd->osidoffset)); | |
152 | nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); | |
153 | ||
154 | nowner_sid_ptr->revision = owner_sid_ptr->revision; | |
155 | nowner_sid_ptr->num_subauth = owner_sid_ptr->num_subauth; | |
156 | for (i = 0; i < 6; i++) | |
157 | nowner_sid_ptr->authority[i] = owner_sid_ptr->authority[i]; | |
158 | for (i = 0; i < 5; i++) | |
159 | nowner_sid_ptr->sub_auth[i] = owner_sid_ptr->sub_auth[i]; | |
160 | ||
161 | /* copy group sid */ | |
162 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
163 | le32_to_cpu(pntsd->gsidoffset)); | |
164 | ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + | |
165 | sizeof(struct cifs_sid)); | |
166 | ||
167 | ngroup_sid_ptr->revision = group_sid_ptr->revision; | |
168 | ngroup_sid_ptr->num_subauth = group_sid_ptr->num_subauth; | |
169 | for (i = 0; i < 6; i++) | |
170 | ngroup_sid_ptr->authority[i] = group_sid_ptr->authority[i]; | |
171 | for (i = 0; i < 5; i++) | |
172 | ngroup_sid_ptr->sub_auth[i] = | |
173 | cpu_to_le32(group_sid_ptr->sub_auth[i]); | |
174 | ||
175 | return; | |
176 | } | |
177 | ||
178 | ||
630f3f0c SF |
179 | /* |
180 | change posix mode to reflect permissions | |
181 | pmode is the existing mode (we only want to overwrite part of this | |
182 | bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 | |
183 | */ | |
9b5e6857 | 184 | static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
15b03959 | 185 | umode_t *pbits_to_set) |
630f3f0c | 186 | { |
9b5e6857 | 187 | __u32 flags = le32_to_cpu(ace_flags); |
15b03959 | 188 | /* the order of ACEs is important. The canonical order is to begin with |
ce06c9f0 | 189 | DENY entries followed by ALLOW, otherwise an allow entry could be |
15b03959 | 190 | encountered first, making the subsequent deny entry like "dead code" |
ce06c9f0 | 191 | which would be superflous since Windows stops when a match is made |
15b03959 SF |
192 | for the operation you are trying to perform for your user */ |
193 | ||
194 | /* For deny ACEs we change the mask so that subsequent allow access | |
195 | control entries do not turn on the bits we are denying */ | |
196 | if (type == ACCESS_DENIED) { | |
ad7a2926 | 197 | if (flags & GENERIC_ALL) |
15b03959 | 198 | *pbits_to_set &= ~S_IRWXUGO; |
ad7a2926 | 199 | |
9b5e6857 AV |
200 | if ((flags & GENERIC_WRITE) || |
201 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 202 | *pbits_to_set &= ~S_IWUGO; |
9b5e6857 AV |
203 | if ((flags & GENERIC_READ) || |
204 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 205 | *pbits_to_set &= ~S_IRUGO; |
9b5e6857 AV |
206 | if ((flags & GENERIC_EXECUTE) || |
207 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 SF |
208 | *pbits_to_set &= ~S_IXUGO; |
209 | return; | |
210 | } else if (type != ACCESS_ALLOWED) { | |
211 | cERROR(1, ("unknown access control type %d", type)); | |
212 | return; | |
213 | } | |
214 | /* else ACCESS_ALLOWED type */ | |
630f3f0c | 215 | |
9b5e6857 | 216 | if (flags & GENERIC_ALL) { |
15b03959 | 217 | *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
630f3f0c | 218 | #ifdef CONFIG_CIFS_DEBUG2 |
d61e5808 | 219 | cFYI(1, ("all perms")); |
630f3f0c | 220 | #endif |
d61e5808 SF |
221 | return; |
222 | } | |
9b5e6857 AV |
223 | if ((flags & GENERIC_WRITE) || |
224 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 225 | *pmode |= (S_IWUGO & (*pbits_to_set)); |
9b5e6857 AV |
226 | if ((flags & GENERIC_READ) || |
227 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 228 | *pmode |= (S_IRUGO & (*pbits_to_set)); |
9b5e6857 AV |
229 | if ((flags & GENERIC_EXECUTE) || |
230 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 | 231 | *pmode |= (S_IXUGO & (*pbits_to_set)); |
630f3f0c | 232 | |
d61e5808 | 233 | #ifdef CONFIG_CIFS_DEBUG2 |
9b5e6857 | 234 | cFYI(1, ("access flags 0x%x mode now 0x%x", flags, *pmode)); |
d61e5808 | 235 | #endif |
630f3f0c SF |
236 | return; |
237 | } | |
238 | ||
ce06c9f0 SF |
239 | /* |
240 | Generate access flags to reflect permissions mode is the existing mode. | |
241 | This function is called for every ACE in the DACL whose SID matches | |
242 | with either owner or group or everyone. | |
243 | */ | |
244 | ||
245 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, | |
246 | __u32 *pace_flags) | |
247 | { | |
248 | /* reset access mask */ | |
249 | *pace_flags = 0x0; | |
250 | ||
251 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ | |
252 | mode &= bits_to_use; | |
253 | ||
254 | /* check for R/W/X UGO since we do not know whose flags | |
255 | is this but we have cleared all the bits sans RWX for | |
256 | either user or group or other as per bits_to_use */ | |
257 | if (mode & S_IRUGO) | |
258 | *pace_flags |= SET_FILE_READ_RIGHTS; | |
259 | if (mode & S_IWUGO) | |
260 | *pace_flags |= SET_FILE_WRITE_RIGHTS; | |
261 | if (mode & S_IXUGO) | |
262 | *pace_flags |= SET_FILE_EXEC_RIGHTS; | |
263 | ||
264 | #ifdef CONFIG_CIFS_DEBUG2 | |
265 | cFYI(1, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags)); | |
266 | #endif | |
267 | return; | |
268 | } | |
269 | ||
97837582 SF |
270 | static __le16 fill_ace_for_sid(struct cifs_ace *pntace, |
271 | const struct cifs_sid *psid, __u64 nmode, umode_t bits) | |
272 | { | |
273 | int i; | |
274 | __u16 size = 0; | |
275 | __u32 access_req = 0; | |
276 | ||
277 | pntace->type = ACCESS_ALLOWED; | |
278 | pntace->flags = 0x0; | |
279 | mode_to_access_flags(nmode, bits, &access_req); | |
280 | if (!access_req) | |
281 | access_req = SET_MINIMUM_RIGHTS; | |
282 | pntace->access_req = cpu_to_le32(access_req); | |
283 | ||
284 | pntace->sid.revision = psid->revision; | |
285 | pntace->sid.num_subauth = psid->num_subauth; | |
286 | for (i = 0; i < 6; i++) | |
287 | pntace->sid.authority[i] = psid->authority[i]; | |
288 | for (i = 0; i < psid->num_subauth; i++) | |
289 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; | |
290 | ||
291 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); | |
292 | pntace->size = cpu_to_le16(size); | |
293 | ||
294 | return (size); | |
295 | } | |
296 | ||
297647c2 | 297 | |
953f8681 SF |
298 | #ifdef CONFIG_CIFS_DEBUG2 |
299 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) | |
d0d66c44 | 300 | { |
d0d66c44 | 301 | int num_subauth; |
d0d66c44 SP |
302 | |
303 | /* validate that we do not go past end of acl */ | |
297647c2 | 304 | |
44093ca2 SF |
305 | if (le16_to_cpu(pace->size) < 16) { |
306 | cERROR(1, ("ACE too small, %d", le16_to_cpu(pace->size))); | |
307 | return; | |
308 | } | |
309 | ||
310 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
d0d66c44 SP |
311 | cERROR(1, ("ACL too small to parse ACE")); |
312 | return; | |
44093ca2 | 313 | } |
d0d66c44 | 314 | |
44093ca2 | 315 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 316 | if (num_subauth) { |
8f18c131 | 317 | int i; |
44093ca2 SF |
318 | cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d", |
319 | pace->sid.revision, pace->sid.num_subauth, pace->type, | |
97837582 | 320 | pace->flags, le16_to_cpu(pace->size))); |
d12fd121 SF |
321 | for (i = 0; i < num_subauth; ++i) { |
322 | cFYI(1, ("ACE sub_auth[%d]: 0x%x", i, | |
44093ca2 | 323 | le32_to_cpu(pace->sid.sub_auth[i]))); |
d12fd121 SF |
324 | } |
325 | ||
326 | /* BB add length check to make sure that we do not have huge | |
327 | num auths and therefore go off the end */ | |
d12fd121 SF |
328 | } |
329 | ||
330 | return; | |
331 | } | |
953f8681 | 332 | #endif |
d12fd121 | 333 | |
d0d66c44 | 334 | |
a750e77c | 335 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 336 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
630f3f0c | 337 | struct inode *inode) |
d0d66c44 SP |
338 | { |
339 | int i; | |
340 | int num_aces = 0; | |
341 | int acl_size; | |
342 | char *acl_base; | |
d0d66c44 SP |
343 | struct cifs_ace **ppace; |
344 | ||
345 | /* BB need to add parm so we can store the SID BB */ | |
346 | ||
2b83457b SF |
347 | if (!pdacl) { |
348 | /* no DACL in the security descriptor, set | |
349 | all the permissions for user/group/other */ | |
350 | inode->i_mode |= S_IRWXUGO; | |
351 | return; | |
352 | } | |
353 | ||
d0d66c44 | 354 | /* validate that we do not go past end of acl */ |
af6f4612 | 355 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
d0d66c44 SP |
356 | cERROR(1, ("ACL too small to parse DACL")); |
357 | return; | |
358 | } | |
359 | ||
360 | #ifdef CONFIG_CIFS_DEBUG2 | |
361 | cFYI(1, ("DACL revision %d size %d num aces %d", | |
af6f4612 SF |
362 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
363 | le32_to_cpu(pdacl->num_aces))); | |
d0d66c44 SP |
364 | #endif |
365 | ||
7505e052 SF |
366 | /* reset rwx permissions for user/group/other. |
367 | Also, if num_aces is 0 i.e. DACL has no ACEs, | |
368 | user/group/other have no permissions */ | |
369 | inode->i_mode &= ~(S_IRWXUGO); | |
370 | ||
d0d66c44 SP |
371 | acl_base = (char *)pdacl; |
372 | acl_size = sizeof(struct cifs_acl); | |
373 | ||
adbc0358 | 374 | num_aces = le32_to_cpu(pdacl->num_aces); |
d0d66c44 | 375 | if (num_aces > 0) { |
15b03959 SF |
376 | umode_t user_mask = S_IRWXU; |
377 | umode_t group_mask = S_IRWXG; | |
378 | umode_t other_mask = S_IRWXO; | |
379 | ||
d0d66c44 SP |
380 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
381 | GFP_KERNEL); | |
382 | ||
d12fd121 | 383 | /* cifscred->cecount = pdacl->num_aces; |
d12fd121 SF |
384 | cifscred->aces = kmalloc(num_aces * |
385 | sizeof(struct cifs_ace *), GFP_KERNEL);*/ | |
d0d66c44 | 386 | |
d0d66c44 | 387 | for (i = 0; i < num_aces; ++i) { |
44093ca2 | 388 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
953f8681 SF |
389 | #ifdef CONFIG_CIFS_DEBUG2 |
390 | dump_ace(ppace[i], end_of_acl); | |
391 | #endif | |
e01b6400 SP |
392 | if (compare_sids(&(ppace[i]->sid), pownersid)) |
393 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
394 | ppace[i]->type, |
395 | &(inode->i_mode), | |
396 | &user_mask); | |
e01b6400 SP |
397 | if (compare_sids(&(ppace[i]->sid), pgrpsid)) |
398 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
399 | ppace[i]->type, |
400 | &(inode->i_mode), | |
401 | &group_mask); | |
e01b6400 SP |
402 | if (compare_sids(&(ppace[i]->sid), &sid_everyone)) |
403 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
404 | ppace[i]->type, |
405 | &(inode->i_mode), | |
406 | &other_mask); | |
e01b6400 | 407 | |
44093ca2 | 408 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
409 | (void *)ppace[i], |
410 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 411 | |
44093ca2 SF |
412 | acl_base = (char *)ppace[i]; |
413 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
414 | } |
415 | ||
416 | kfree(ppace); | |
d0d66c44 SP |
417 | } |
418 | ||
419 | return; | |
420 | } | |
421 | ||
bcb02034 | 422 | |
97837582 SF |
423 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
424 | struct cifs_sid *pgrpsid, __u64 nmode) | |
425 | { | |
426 | __le16 size = 0; | |
427 | struct cifs_acl *pnndacl; | |
428 | ||
429 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); | |
430 | ||
431 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), | |
432 | pownersid, nmode, S_IRWXU); | |
433 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
434 | pgrpsid, nmode, S_IRWXG); | |
435 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
436 | &sid_everyone, nmode, S_IRWXO); | |
437 | ||
438 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); | |
439 | pndacl->num_aces = 3; | |
440 | ||
441 | return (0); | |
442 | } | |
443 | ||
444 | ||
bcb02034 SF |
445 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
446 | { | |
447 | /* BB need to add parm so we can store the SID BB */ | |
448 | ||
b9c7a2bb SF |
449 | /* validate that we do not go past end of ACL - sid must be at least 8 |
450 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
451 | if (end_of_acl < (char *)psid + 8) { | |
452 | cERROR(1, ("ACL too small to parse SID %p", psid)); | |
bcb02034 SF |
453 | return -EINVAL; |
454 | } | |
d0d66c44 | 455 | |
af6f4612 | 456 | if (psid->num_subauth) { |
bcb02034 | 457 | #ifdef CONFIG_CIFS_DEBUG2 |
8f18c131 | 458 | int i; |
44093ca2 SF |
459 | cFYI(1, ("SID revision %d num_auth %d", |
460 | psid->revision, psid->num_subauth)); | |
bcb02034 | 461 | |
af6f4612 | 462 | for (i = 0; i < psid->num_subauth; i++) { |
d0d66c44 | 463 | cFYI(1, ("SID sub_auth[%d]: 0x%x ", i, |
297647c2 | 464 | le32_to_cpu(psid->sub_auth[i]))); |
d0d66c44 SP |
465 | } |
466 | ||
d12fd121 | 467 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 468 | num auths and therefore go off the end */ |
d12fd121 | 469 | cFYI(1, ("RID 0x%x", |
af6f4612 | 470 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1]))); |
bcb02034 | 471 | #endif |
d0d66c44 SP |
472 | } |
473 | ||
bcb02034 SF |
474 | return 0; |
475 | } | |
476 | ||
d0d66c44 | 477 | |
bcb02034 | 478 | /* Convert CIFS ACL to POSIX form */ |
630f3f0c SF |
479 | static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, |
480 | struct inode *inode) | |
bcb02034 | 481 | { |
d0d66c44 | 482 | int rc; |
bcb02034 SF |
483 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
484 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 | 485 | char *end_of_acl = ((char *)pntsd) + acl_len; |
7505e052 | 486 | __u32 dacloffset; |
bcb02034 | 487 | |
b9c7a2bb SF |
488 | if ((inode == NULL) || (pntsd == NULL)) |
489 | return -EIO; | |
490 | ||
bcb02034 | 491 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 492 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 493 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 494 | le32_to_cpu(pntsd->gsidoffset)); |
7505e052 | 495 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
63d2583f | 496 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
bcb02034 SF |
497 | #ifdef CONFIG_CIFS_DEBUG2 |
498 | cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x " | |
499 | "sacloffset 0x%x dacloffset 0x%x", | |
af6f4612 SF |
500 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
501 | le32_to_cpu(pntsd->gsidoffset), | |
7505e052 | 502 | le32_to_cpu(pntsd->sacloffset), dacloffset)); |
bcb02034 | 503 | #endif |
b9c7a2bb | 504 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 SF |
505 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
506 | if (rc) | |
507 | return rc; | |
508 | ||
509 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
510 | if (rc) | |
511 | return rc; | |
512 | ||
7505e052 SF |
513 | if (dacloffset) |
514 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, | |
63d2583f | 515 | group_sid_ptr, inode); |
7505e052 SF |
516 | else |
517 | cFYI(1, ("no ACL")); /* BB grant all or default perms? */ | |
d0d66c44 | 518 | |
bcb02034 SF |
519 | /* cifscred->uid = owner_sid_ptr->rid; |
520 | cifscred->gid = group_sid_ptr->rid; | |
521 | memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr, | |
630f3f0c | 522 | sizeof(struct cifs_sid)); |
bcb02034 | 523 | memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr, |
630f3f0c | 524 | sizeof(struct cifs_sid)); */ |
bcb02034 | 525 | |
297647c2 | 526 | |
bcb02034 SF |
527 | return (0); |
528 | } | |
b9c7a2bb SF |
529 | |
530 | ||
97837582 SF |
531 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
532 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, | |
533 | int acl_len, struct inode *inode, __u64 nmode) | |
534 | { | |
535 | int rc = 0; | |
536 | __u32 dacloffset; | |
537 | __u32 ndacloffset; | |
538 | __u32 sidsoffset; | |
539 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
540 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ | |
541 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ | |
542 | ||
543 | if ((inode == NULL) || (pntsd == NULL) || (pnntsd == NULL)) | |
544 | return (-EIO); | |
545 | ||
546 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
547 | le32_to_cpu(pntsd->osidoffset)); | |
548 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
549 | le32_to_cpu(pntsd->gsidoffset)); | |
550 | ||
551 | dacloffset = le32_to_cpu(pntsd->dacloffset); | |
552 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); | |
553 | ||
554 | ndacloffset = sizeof(struct cifs_ntsd); | |
555 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); | |
556 | ndacl_ptr->revision = dacl_ptr->revision; | |
557 | ndacl_ptr->size = 0; | |
558 | ndacl_ptr->num_aces = 0; | |
559 | ||
560 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, nmode); | |
561 | ||
562 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); | |
563 | ||
564 | /* copy security descriptor control portion and owner and group sid */ | |
565 | copy_sec_desc(pntsd, pnntsd, sidsoffset); | |
566 | ||
567 | return (rc); | |
568 | } | |
569 | ||
570 | ||
7505e052 SF |
571 | /* Retrieve an ACL from the server */ |
572 | static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode, | |
573 | const char *path) | |
b9c7a2bb SF |
574 | { |
575 | struct cifsFileInfo *open_file; | |
576 | int unlock_file = FALSE; | |
577 | int xid; | |
578 | int rc = -EIO; | |
579 | __u16 fid; | |
580 | struct super_block *sb; | |
581 | struct cifs_sb_info *cifs_sb; | |
582 | struct cifs_ntsd *pntsd = NULL; | |
b9c7a2bb SF |
583 | |
584 | cFYI(1, ("get mode from ACL for %s", path)); | |
585 | ||
586 | if (inode == NULL) | |
7505e052 | 587 | return NULL; |
b9c7a2bb SF |
588 | |
589 | xid = GetXid(); | |
590 | open_file = find_readable_file(CIFS_I(inode)); | |
591 | sb = inode->i_sb; | |
592 | if (sb == NULL) { | |
593 | FreeXid(xid); | |
7505e052 | 594 | return NULL; |
b9c7a2bb SF |
595 | } |
596 | cifs_sb = CIFS_SB(sb); | |
597 | ||
598 | if (open_file) { | |
599 | unlock_file = TRUE; | |
600 | fid = open_file->netfid; | |
601 | } else { | |
602 | int oplock = FALSE; | |
603 | /* open file */ | |
604 | rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, | |
953f8681 | 605 | READ_CONTROL, 0, &fid, &oplock, NULL, |
b9c7a2bb SF |
606 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
607 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
608 | if (rc != 0) { | |
609 | cERROR(1, ("Unable to open file to get ACL")); | |
610 | FreeXid(xid); | |
7505e052 | 611 | return NULL; |
b9c7a2bb SF |
612 | } |
613 | } | |
614 | ||
7505e052 SF |
615 | rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen); |
616 | cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen)); | |
b9c7a2bb SF |
617 | if (unlock_file == TRUE) |
618 | atomic_dec(&open_file->wrtPending); | |
619 | else | |
620 | CIFSSMBClose(xid, cifs_sb->tcon, fid); | |
621 | ||
7505e052 SF |
622 | FreeXid(xid); |
623 | return pntsd; | |
624 | } | |
625 | ||
97837582 SF |
626 | /* Set an ACL on the server */ |
627 | static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, | |
628 | struct inode *inode, const char *path) | |
629 | { | |
630 | struct cifsFileInfo *open_file; | |
631 | int unlock_file = FALSE; | |
632 | int xid; | |
633 | int rc = -EIO; | |
634 | __u16 fid; | |
635 | struct super_block *sb; | |
636 | struct cifs_sb_info *cifs_sb; | |
637 | ||
638 | #ifdef CONFIG_CIFS_DEBUG2 | |
639 | cFYI(1, ("set ACL for %s from mode 0x%x", path, inode->i_mode)); | |
640 | #endif | |
641 | ||
642 | if (!inode) | |
643 | return (rc); | |
644 | ||
645 | sb = inode->i_sb; | |
646 | if (sb == NULL) | |
647 | return (rc); | |
648 | ||
649 | cifs_sb = CIFS_SB(sb); | |
650 | xid = GetXid(); | |
651 | ||
652 | open_file = find_readable_file(CIFS_I(inode)); | |
653 | if (open_file) { | |
654 | unlock_file = TRUE; | |
655 | fid = open_file->netfid; | |
656 | } else { | |
657 | int oplock = FALSE; | |
658 | /* open file */ | |
659 | rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, | |
660 | WRITE_DAC, 0, &fid, &oplock, NULL, | |
661 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & | |
662 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
663 | if (rc != 0) { | |
664 | cERROR(1, ("Unable to open file to set ACL")); | |
665 | FreeXid(xid); | |
666 | return (rc); | |
667 | } | |
668 | } | |
669 | ||
670 | rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen); | |
671 | #ifdef CONFIG_CIFS_DEBUG2 | |
672 | cFYI(1, ("SetCIFSACL rc = %d", rc)); | |
673 | #endif | |
674 | if (unlock_file == TRUE) | |
675 | atomic_dec(&open_file->wrtPending); | |
676 | else | |
677 | CIFSSMBClose(xid, cifs_sb->tcon, fid); | |
678 | ||
679 | FreeXid(xid); | |
680 | ||
681 | return (rc); | |
682 | } | |
683 | ||
7505e052 SF |
684 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ |
685 | void acl_to_uid_mode(struct inode *inode, const char *path) | |
686 | { | |
687 | struct cifs_ntsd *pntsd = NULL; | |
688 | u32 acllen = 0; | |
689 | int rc = 0; | |
690 | ||
691 | #ifdef CONFIG_CIFS_DEBUG2 | |
692 | cFYI(1, ("converting ACL to mode for %s", path)); | |
693 | #endif | |
694 | pntsd = get_cifs_acl(&acllen, inode, path); | |
695 | ||
696 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ | |
697 | if (pntsd) | |
b9c7a2bb | 698 | rc = parse_sec_desc(pntsd, acllen, inode); |
7505e052 SF |
699 | if (rc) |
700 | cFYI(1, ("parse sec desc failed rc = %d", rc)); | |
701 | ||
b9c7a2bb | 702 | kfree(pntsd); |
b9c7a2bb SF |
703 | return; |
704 | } | |
953f8681 | 705 | |
7505e052 | 706 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
97837582 | 707 | int mode_to_acl(struct inode *inode, const char *path, __u64 nmode) |
953f8681 SF |
708 | { |
709 | int rc = 0; | |
710 | __u32 acllen = 0; | |
97837582 SF |
711 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
712 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ | |
953f8681 | 713 | |
97837582 | 714 | #ifdef CONFIG_CIFS_DEBUG2 |
953f8681 | 715 | cFYI(1, ("set ACL from mode for %s", path)); |
97837582 | 716 | #endif |
953f8681 SF |
717 | |
718 | /* Get the security descriptor */ | |
7505e052 | 719 | pntsd = get_cifs_acl(&acllen, inode, path); |
953f8681 | 720 | |
97837582 SF |
721 | /* Add three ACEs for owner, group, everyone getting rid of |
722 | other ACEs as chmod disables ACEs and set the security descriptor */ | |
953f8681 | 723 | |
97837582 SF |
724 | if (pntsd) { |
725 | /* allocate memory for the smb header, | |
726 | set security descriptor request security descriptor | |
727 | parameters, and secuirty descriptor itself */ | |
953f8681 | 728 | |
97837582 SF |
729 | pnntsd = kmalloc(acllen, GFP_KERNEL); |
730 | if (!pnntsd) { | |
731 | cERROR(1, ("Unable to allocate security descriptor")); | |
732 | kfree(pntsd); | |
733 | return (-ENOMEM); | |
734 | } | |
7505e052 | 735 | |
97837582 SF |
736 | rc = build_sec_desc(pntsd, pnntsd, acllen, inode, nmode); |
737 | ||
738 | #ifdef CONFIG_CIFS_DEBUG2 | |
739 | cFYI(1, ("build_sec_desc rc: %d", rc)); | |
740 | #endif | |
741 | ||
742 | if (!rc) { | |
743 | /* Set the security descriptor */ | |
744 | rc = set_cifs_acl(pnntsd, acllen, inode, path); | |
745 | #ifdef CONFIG_CIFS_DEBUG2 | |
746 | cFYI(1, ("set_cifs_acl rc: %d", rc)); | |
747 | #endif | |
748 | } | |
749 | ||
750 | kfree(pnntsd); | |
751 | kfree(pntsd); | |
752 | } | |
753 | ||
754 | return (rc); | |
953f8681 | 755 | } |
297647c2 | 756 | #endif /* CONFIG_CIFS_EXPERIMENTAL */ |