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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 SF |
48 | /* group users */ |
49 | static const struct cifs_sid sid_user = | |
d12fd121 | 50 | {1, 2 , {0, 0, 0, 0, 0, 5}, {} }; |
d0d66c44 | 51 | |
297647c2 SF |
52 | |
53 | int match_sid(struct cifs_sid *ctsid) | |
54 | { | |
55 | int i, j; | |
56 | int num_subauth, num_sat, num_saw; | |
57 | struct cifs_sid *cwsid; | |
58 | ||
59 | if (!ctsid) | |
60 | return (-1); | |
61 | ||
62 | for (i = 0; i < NUM_WK_SIDS; ++i) { | |
63 | cwsid = &(wksidarr[i].cifssid); | |
64 | ||
65 | /* compare the revision */ | |
66 | if (ctsid->revision != cwsid->revision) | |
67 | continue; | |
68 | ||
69 | /* compare all of the six auth values */ | |
70 | for (j = 0; j < 6; ++j) { | |
71 | if (ctsid->authority[j] != cwsid->authority[j]) | |
72 | break; | |
73 | } | |
74 | if (j < 6) | |
75 | continue; /* all of the auth values did not match */ | |
76 | ||
77 | /* compare all of the subauth values if any */ | |
ce51ae14 DK |
78 | num_sat = ctsid->num_subauth; |
79 | num_saw = cwsid->num_subauth; | |
297647c2 SF |
80 | num_subauth = num_sat < num_saw ? num_sat : num_saw; |
81 | if (num_subauth) { | |
82 | for (j = 0; j < num_subauth; ++j) { | |
83 | if (ctsid->sub_auth[j] != cwsid->sub_auth[j]) | |
84 | break; | |
85 | } | |
86 | if (j < num_subauth) | |
87 | continue; /* all sub_auth values do not match */ | |
88 | } | |
89 | ||
90 | cFYI(1, ("matching sid: %s\n", wksidarr[i].sidname)); | |
91 | return (0); /* sids compare/match */ | |
92 | } | |
93 | ||
94 | cFYI(1, ("No matching sid")); | |
95 | return (-1); | |
96 | } | |
97 | ||
a750e77c SF |
98 | /* if the two SIDs (roughly equivalent to a UUID for a user or group) are |
99 | the same returns 1, if they do not match returns 0 */ | |
630f3f0c | 100 | int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) |
297647c2 SF |
101 | { |
102 | int i; | |
103 | int num_subauth, num_sat, num_saw; | |
104 | ||
105 | if ((!ctsid) || (!cwsid)) | |
a750e77c | 106 | return (0); |
297647c2 SF |
107 | |
108 | /* compare the revision */ | |
109 | if (ctsid->revision != cwsid->revision) | |
a750e77c | 110 | return (0); |
297647c2 SF |
111 | |
112 | /* compare all of the six auth values */ | |
113 | for (i = 0; i < 6; ++i) { | |
114 | if (ctsid->authority[i] != cwsid->authority[i]) | |
a750e77c | 115 | return (0); |
297647c2 SF |
116 | } |
117 | ||
118 | /* compare all of the subauth values if any */ | |
adbc0358 | 119 | num_sat = ctsid->num_subauth; |
adddd49d | 120 | num_saw = cwsid->num_subauth; |
297647c2 SF |
121 | num_subauth = num_sat < num_saw ? num_sat : num_saw; |
122 | if (num_subauth) { | |
123 | for (i = 0; i < num_subauth; ++i) { | |
124 | if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) | |
a750e77c | 125 | return (0); |
297647c2 SF |
126 | } |
127 | } | |
128 | ||
a750e77c | 129 | return (1); /* sids compare/match */ |
297647c2 SF |
130 | } |
131 | ||
97837582 SF |
132 | |
133 | /* copy ntsd, owner sid, and group sid from a security descriptor to another */ | |
134 | static void copy_sec_desc(const struct cifs_ntsd *pntsd, | |
135 | struct cifs_ntsd *pnntsd, __u32 sidsoffset) | |
136 | { | |
137 | int i; | |
138 | ||
139 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
140 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; | |
141 | ||
142 | /* copy security descriptor control portion */ | |
143 | pnntsd->revision = pntsd->revision; | |
144 | pnntsd->type = pntsd->type; | |
145 | pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); | |
146 | pnntsd->sacloffset = 0; | |
147 | pnntsd->osidoffset = cpu_to_le32(sidsoffset); | |
148 | pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); | |
149 | ||
150 | /* copy owner sid */ | |
151 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
152 | le32_to_cpu(pntsd->osidoffset)); | |
153 | nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); | |
154 | ||
155 | nowner_sid_ptr->revision = owner_sid_ptr->revision; | |
156 | nowner_sid_ptr->num_subauth = owner_sid_ptr->num_subauth; | |
157 | for (i = 0; i < 6; i++) | |
158 | nowner_sid_ptr->authority[i] = owner_sid_ptr->authority[i]; | |
159 | for (i = 0; i < 5; i++) | |
160 | nowner_sid_ptr->sub_auth[i] = owner_sid_ptr->sub_auth[i]; | |
161 | ||
162 | /* copy group sid */ | |
163 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
164 | le32_to_cpu(pntsd->gsidoffset)); | |
165 | ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + | |
166 | sizeof(struct cifs_sid)); | |
167 | ||
168 | ngroup_sid_ptr->revision = group_sid_ptr->revision; | |
169 | ngroup_sid_ptr->num_subauth = group_sid_ptr->num_subauth; | |
170 | for (i = 0; i < 6; i++) | |
171 | ngroup_sid_ptr->authority[i] = group_sid_ptr->authority[i]; | |
172 | for (i = 0; i < 5; i++) | |
173 | ngroup_sid_ptr->sub_auth[i] = | |
174 | cpu_to_le32(group_sid_ptr->sub_auth[i]); | |
175 | ||
176 | return; | |
177 | } | |
178 | ||
179 | ||
630f3f0c SF |
180 | /* |
181 | change posix mode to reflect permissions | |
182 | pmode is the existing mode (we only want to overwrite part of this | |
183 | bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 | |
184 | */ | |
9b5e6857 | 185 | static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
15b03959 | 186 | umode_t *pbits_to_set) |
630f3f0c | 187 | { |
9b5e6857 | 188 | __u32 flags = le32_to_cpu(ace_flags); |
15b03959 | 189 | /* the order of ACEs is important. The canonical order is to begin with |
ce06c9f0 | 190 | DENY entries followed by ALLOW, otherwise an allow entry could be |
15b03959 | 191 | encountered first, making the subsequent deny entry like "dead code" |
ce06c9f0 | 192 | which would be superflous since Windows stops when a match is made |
15b03959 SF |
193 | for the operation you are trying to perform for your user */ |
194 | ||
195 | /* For deny ACEs we change the mask so that subsequent allow access | |
196 | control entries do not turn on the bits we are denying */ | |
197 | if (type == ACCESS_DENIED) { | |
9b5e6857 | 198 | if (flags & GENERIC_ALL) { |
15b03959 SF |
199 | *pbits_to_set &= ~S_IRWXUGO; |
200 | } | |
9b5e6857 AV |
201 | if ((flags & GENERIC_WRITE) || |
202 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 203 | *pbits_to_set &= ~S_IWUGO; |
9b5e6857 AV |
204 | if ((flags & GENERIC_READ) || |
205 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 206 | *pbits_to_set &= ~S_IRUGO; |
9b5e6857 AV |
207 | if ((flags & GENERIC_EXECUTE) || |
208 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 SF |
209 | *pbits_to_set &= ~S_IXUGO; |
210 | return; | |
211 | } else if (type != ACCESS_ALLOWED) { | |
212 | cERROR(1, ("unknown access control type %d", type)); | |
213 | return; | |
214 | } | |
215 | /* else ACCESS_ALLOWED type */ | |
630f3f0c | 216 | |
9b5e6857 | 217 | if (flags & GENERIC_ALL) { |
15b03959 | 218 | *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
630f3f0c | 219 | #ifdef CONFIG_CIFS_DEBUG2 |
d61e5808 | 220 | cFYI(1, ("all perms")); |
630f3f0c | 221 | #endif |
d61e5808 SF |
222 | return; |
223 | } | |
9b5e6857 AV |
224 | if ((flags & GENERIC_WRITE) || |
225 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 226 | *pmode |= (S_IWUGO & (*pbits_to_set)); |
9b5e6857 AV |
227 | if ((flags & GENERIC_READ) || |
228 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 229 | *pmode |= (S_IRUGO & (*pbits_to_set)); |
9b5e6857 AV |
230 | if ((flags & GENERIC_EXECUTE) || |
231 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 | 232 | *pmode |= (S_IXUGO & (*pbits_to_set)); |
630f3f0c | 233 | |
d61e5808 | 234 | #ifdef CONFIG_CIFS_DEBUG2 |
9b5e6857 | 235 | cFYI(1, ("access flags 0x%x mode now 0x%x", flags, *pmode)); |
d61e5808 | 236 | #endif |
630f3f0c SF |
237 | return; |
238 | } | |
239 | ||
ce06c9f0 SF |
240 | /* |
241 | Generate access flags to reflect permissions mode is the existing mode. | |
242 | This function is called for every ACE in the DACL whose SID matches | |
243 | with either owner or group or everyone. | |
244 | */ | |
245 | ||
246 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, | |
247 | __u32 *pace_flags) | |
248 | { | |
249 | /* reset access mask */ | |
250 | *pace_flags = 0x0; | |
251 | ||
252 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ | |
253 | mode &= bits_to_use; | |
254 | ||
255 | /* check for R/W/X UGO since we do not know whose flags | |
256 | is this but we have cleared all the bits sans RWX for | |
257 | either user or group or other as per bits_to_use */ | |
258 | if (mode & S_IRUGO) | |
259 | *pace_flags |= SET_FILE_READ_RIGHTS; | |
260 | if (mode & S_IWUGO) | |
261 | *pace_flags |= SET_FILE_WRITE_RIGHTS; | |
262 | if (mode & S_IXUGO) | |
263 | *pace_flags |= SET_FILE_EXEC_RIGHTS; | |
264 | ||
265 | #ifdef CONFIG_CIFS_DEBUG2 | |
266 | cFYI(1, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags)); | |
267 | #endif | |
268 | return; | |
269 | } | |
270 | ||
97837582 SF |
271 | static __le16 fill_ace_for_sid(struct cifs_ace *pntace, |
272 | const struct cifs_sid *psid, __u64 nmode, umode_t bits) | |
273 | { | |
274 | int i; | |
275 | __u16 size = 0; | |
276 | __u32 access_req = 0; | |
277 | ||
278 | pntace->type = ACCESS_ALLOWED; | |
279 | pntace->flags = 0x0; | |
280 | mode_to_access_flags(nmode, bits, &access_req); | |
281 | if (!access_req) | |
282 | access_req = SET_MINIMUM_RIGHTS; | |
283 | pntace->access_req = cpu_to_le32(access_req); | |
284 | ||
285 | pntace->sid.revision = psid->revision; | |
286 | pntace->sid.num_subauth = psid->num_subauth; | |
287 | for (i = 0; i < 6; i++) | |
288 | pntace->sid.authority[i] = psid->authority[i]; | |
289 | for (i = 0; i < psid->num_subauth; i++) | |
290 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; | |
291 | ||
292 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); | |
293 | pntace->size = cpu_to_le16(size); | |
294 | ||
295 | return (size); | |
296 | } | |
297 | ||
297647c2 | 298 | |
953f8681 SF |
299 | #ifdef CONFIG_CIFS_DEBUG2 |
300 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) | |
d0d66c44 | 301 | { |
d0d66c44 | 302 | int num_subauth; |
d0d66c44 SP |
303 | |
304 | /* validate that we do not go past end of acl */ | |
297647c2 | 305 | |
44093ca2 SF |
306 | if (le16_to_cpu(pace->size) < 16) { |
307 | cERROR(1, ("ACE too small, %d", le16_to_cpu(pace->size))); | |
308 | return; | |
309 | } | |
310 | ||
311 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
d0d66c44 SP |
312 | cERROR(1, ("ACL too small to parse ACE")); |
313 | return; | |
44093ca2 | 314 | } |
d0d66c44 | 315 | |
44093ca2 | 316 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 317 | if (num_subauth) { |
8f18c131 | 318 | int i; |
44093ca2 SF |
319 | cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d", |
320 | pace->sid.revision, pace->sid.num_subauth, pace->type, | |
97837582 | 321 | pace->flags, le16_to_cpu(pace->size))); |
d12fd121 SF |
322 | for (i = 0; i < num_subauth; ++i) { |
323 | cFYI(1, ("ACE sub_auth[%d]: 0x%x", i, | |
44093ca2 | 324 | le32_to_cpu(pace->sid.sub_auth[i]))); |
d12fd121 SF |
325 | } |
326 | ||
327 | /* BB add length check to make sure that we do not have huge | |
328 | num auths and therefore go off the end */ | |
d12fd121 SF |
329 | } |
330 | ||
331 | return; | |
332 | } | |
953f8681 | 333 | #endif |
d12fd121 | 334 | |
d0d66c44 | 335 | |
a750e77c | 336 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 337 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
630f3f0c | 338 | struct inode *inode) |
d0d66c44 SP |
339 | { |
340 | int i; | |
341 | int num_aces = 0; | |
342 | int acl_size; | |
343 | char *acl_base; | |
d0d66c44 SP |
344 | struct cifs_ace **ppace; |
345 | ||
346 | /* BB need to add parm so we can store the SID BB */ | |
347 | ||
2b83457b SF |
348 | if (!pdacl) { |
349 | /* no DACL in the security descriptor, set | |
350 | all the permissions for user/group/other */ | |
351 | inode->i_mode |= S_IRWXUGO; | |
352 | return; | |
353 | } | |
354 | ||
d0d66c44 | 355 | /* validate that we do not go past end of acl */ |
af6f4612 | 356 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
d0d66c44 SP |
357 | cERROR(1, ("ACL too small to parse DACL")); |
358 | return; | |
359 | } | |
360 | ||
361 | #ifdef CONFIG_CIFS_DEBUG2 | |
362 | cFYI(1, ("DACL revision %d size %d num aces %d", | |
af6f4612 SF |
363 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
364 | le32_to_cpu(pdacl->num_aces))); | |
d0d66c44 SP |
365 | #endif |
366 | ||
7505e052 SF |
367 | /* reset rwx permissions for user/group/other. |
368 | Also, if num_aces is 0 i.e. DACL has no ACEs, | |
369 | user/group/other have no permissions */ | |
370 | inode->i_mode &= ~(S_IRWXUGO); | |
371 | ||
d0d66c44 SP |
372 | acl_base = (char *)pdacl; |
373 | acl_size = sizeof(struct cifs_acl); | |
374 | ||
adbc0358 | 375 | num_aces = le32_to_cpu(pdacl->num_aces); |
d0d66c44 | 376 | if (num_aces > 0) { |
15b03959 SF |
377 | umode_t user_mask = S_IRWXU; |
378 | umode_t group_mask = S_IRWXG; | |
379 | umode_t other_mask = S_IRWXO; | |
380 | ||
d0d66c44 SP |
381 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
382 | GFP_KERNEL); | |
383 | ||
d12fd121 | 384 | /* cifscred->cecount = pdacl->num_aces; |
d12fd121 SF |
385 | cifscred->aces = kmalloc(num_aces * |
386 | sizeof(struct cifs_ace *), GFP_KERNEL);*/ | |
d0d66c44 | 387 | |
d0d66c44 | 388 | for (i = 0; i < num_aces; ++i) { |
44093ca2 | 389 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
953f8681 SF |
390 | #ifdef CONFIG_CIFS_DEBUG2 |
391 | dump_ace(ppace[i], end_of_acl); | |
392 | #endif | |
e01b6400 SP |
393 | if (compare_sids(&(ppace[i]->sid), pownersid)) |
394 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
395 | ppace[i]->type, |
396 | &(inode->i_mode), | |
397 | &user_mask); | |
e01b6400 SP |
398 | if (compare_sids(&(ppace[i]->sid), pgrpsid)) |
399 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
400 | ppace[i]->type, |
401 | &(inode->i_mode), | |
402 | &group_mask); | |
e01b6400 SP |
403 | if (compare_sids(&(ppace[i]->sid), &sid_everyone)) |
404 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
405 | ppace[i]->type, |
406 | &(inode->i_mode), | |
407 | &other_mask); | |
e01b6400 | 408 | |
44093ca2 | 409 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
410 | (void *)ppace[i], |
411 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 412 | |
44093ca2 SF |
413 | acl_base = (char *)ppace[i]; |
414 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
415 | } |
416 | ||
417 | kfree(ppace); | |
d0d66c44 SP |
418 | } |
419 | ||
420 | return; | |
421 | } | |
422 | ||
bcb02034 | 423 | |
97837582 SF |
424 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
425 | struct cifs_sid *pgrpsid, __u64 nmode) | |
426 | { | |
427 | __le16 size = 0; | |
428 | struct cifs_acl *pnndacl; | |
429 | ||
430 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); | |
431 | ||
432 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), | |
433 | pownersid, nmode, S_IRWXU); | |
434 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
435 | pgrpsid, nmode, S_IRWXG); | |
436 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
437 | &sid_everyone, nmode, S_IRWXO); | |
438 | ||
439 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); | |
440 | pndacl->num_aces = 3; | |
441 | ||
442 | return (0); | |
443 | } | |
444 | ||
445 | ||
bcb02034 SF |
446 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
447 | { | |
448 | /* BB need to add parm so we can store the SID BB */ | |
449 | ||
b9c7a2bb SF |
450 | /* validate that we do not go past end of ACL - sid must be at least 8 |
451 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
452 | if (end_of_acl < (char *)psid + 8) { | |
453 | cERROR(1, ("ACL too small to parse SID %p", psid)); | |
bcb02034 SF |
454 | return -EINVAL; |
455 | } | |
d0d66c44 | 456 | |
af6f4612 | 457 | if (psid->num_subauth) { |
bcb02034 | 458 | #ifdef CONFIG_CIFS_DEBUG2 |
8f18c131 | 459 | int i; |
44093ca2 SF |
460 | cFYI(1, ("SID revision %d num_auth %d", |
461 | psid->revision, psid->num_subauth)); | |
bcb02034 | 462 | |
af6f4612 | 463 | for (i = 0; i < psid->num_subauth; i++) { |
d0d66c44 | 464 | cFYI(1, ("SID sub_auth[%d]: 0x%x ", i, |
297647c2 | 465 | le32_to_cpu(psid->sub_auth[i]))); |
d0d66c44 SP |
466 | } |
467 | ||
d12fd121 | 468 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 469 | num auths and therefore go off the end */ |
d12fd121 | 470 | cFYI(1, ("RID 0x%x", |
af6f4612 | 471 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1]))); |
bcb02034 | 472 | #endif |
d0d66c44 SP |
473 | } |
474 | ||
bcb02034 SF |
475 | return 0; |
476 | } | |
477 | ||
d0d66c44 | 478 | |
bcb02034 | 479 | /* Convert CIFS ACL to POSIX form */ |
630f3f0c SF |
480 | static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, |
481 | struct inode *inode) | |
bcb02034 | 482 | { |
d0d66c44 | 483 | int rc; |
bcb02034 SF |
484 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
485 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 | 486 | char *end_of_acl = ((char *)pntsd) + acl_len; |
7505e052 | 487 | __u32 dacloffset; |
bcb02034 | 488 | |
b9c7a2bb SF |
489 | if ((inode == NULL) || (pntsd == NULL)) |
490 | return -EIO; | |
491 | ||
bcb02034 | 492 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 493 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 494 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 495 | le32_to_cpu(pntsd->gsidoffset)); |
7505e052 | 496 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
63d2583f | 497 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
bcb02034 SF |
498 | #ifdef CONFIG_CIFS_DEBUG2 |
499 | cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x " | |
500 | "sacloffset 0x%x dacloffset 0x%x", | |
af6f4612 SF |
501 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
502 | le32_to_cpu(pntsd->gsidoffset), | |
7505e052 | 503 | le32_to_cpu(pntsd->sacloffset), dacloffset)); |
bcb02034 | 504 | #endif |
b9c7a2bb | 505 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 SF |
506 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
507 | if (rc) | |
508 | return rc; | |
509 | ||
510 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
511 | if (rc) | |
512 | return rc; | |
513 | ||
7505e052 SF |
514 | if (dacloffset) |
515 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, | |
63d2583f | 516 | group_sid_ptr, inode); |
7505e052 SF |
517 | else |
518 | cFYI(1, ("no ACL")); /* BB grant all or default perms? */ | |
d0d66c44 | 519 | |
bcb02034 SF |
520 | /* cifscred->uid = owner_sid_ptr->rid; |
521 | cifscred->gid = group_sid_ptr->rid; | |
522 | memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr, | |
630f3f0c | 523 | sizeof(struct cifs_sid)); |
bcb02034 | 524 | memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr, |
630f3f0c | 525 | sizeof(struct cifs_sid)); */ |
bcb02034 | 526 | |
297647c2 | 527 | |
bcb02034 SF |
528 | return (0); |
529 | } | |
b9c7a2bb SF |
530 | |
531 | ||
97837582 SF |
532 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
533 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, | |
534 | int acl_len, struct inode *inode, __u64 nmode) | |
535 | { | |
536 | int rc = 0; | |
537 | __u32 dacloffset; | |
538 | __u32 ndacloffset; | |
539 | __u32 sidsoffset; | |
540 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
541 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ | |
542 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ | |
543 | ||
544 | if ((inode == NULL) || (pntsd == NULL) || (pnntsd == NULL)) | |
545 | return (-EIO); | |
546 | ||
547 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
548 | le32_to_cpu(pntsd->osidoffset)); | |
549 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
550 | le32_to_cpu(pntsd->gsidoffset)); | |
551 | ||
552 | dacloffset = le32_to_cpu(pntsd->dacloffset); | |
553 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); | |
554 | ||
555 | ndacloffset = sizeof(struct cifs_ntsd); | |
556 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); | |
557 | ndacl_ptr->revision = dacl_ptr->revision; | |
558 | ndacl_ptr->size = 0; | |
559 | ndacl_ptr->num_aces = 0; | |
560 | ||
561 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, nmode); | |
562 | ||
563 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); | |
564 | ||
565 | /* copy security descriptor control portion and owner and group sid */ | |
566 | copy_sec_desc(pntsd, pnntsd, sidsoffset); | |
567 | ||
568 | return (rc); | |
569 | } | |
570 | ||
571 | ||
7505e052 SF |
572 | /* Retrieve an ACL from the server */ |
573 | static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode, | |
574 | const char *path) | |
b9c7a2bb SF |
575 | { |
576 | struct cifsFileInfo *open_file; | |
577 | int unlock_file = FALSE; | |
578 | int xid; | |
579 | int rc = -EIO; | |
580 | __u16 fid; | |
581 | struct super_block *sb; | |
582 | struct cifs_sb_info *cifs_sb; | |
583 | struct cifs_ntsd *pntsd = NULL; | |
b9c7a2bb SF |
584 | |
585 | cFYI(1, ("get mode from ACL for %s", path)); | |
586 | ||
587 | if (inode == NULL) | |
7505e052 | 588 | return NULL; |
b9c7a2bb SF |
589 | |
590 | xid = GetXid(); | |
591 | open_file = find_readable_file(CIFS_I(inode)); | |
592 | sb = inode->i_sb; | |
593 | if (sb == NULL) { | |
594 | FreeXid(xid); | |
7505e052 | 595 | return NULL; |
b9c7a2bb SF |
596 | } |
597 | cifs_sb = CIFS_SB(sb); | |
598 | ||
599 | if (open_file) { | |
600 | unlock_file = TRUE; | |
601 | fid = open_file->netfid; | |
602 | } else { | |
603 | int oplock = FALSE; | |
604 | /* open file */ | |
605 | rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, | |
953f8681 | 606 | READ_CONTROL, 0, &fid, &oplock, NULL, |
b9c7a2bb SF |
607 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
608 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
609 | if (rc != 0) { | |
610 | cERROR(1, ("Unable to open file to get ACL")); | |
611 | FreeXid(xid); | |
7505e052 | 612 | return NULL; |
b9c7a2bb SF |
613 | } |
614 | } | |
615 | ||
7505e052 SF |
616 | rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen); |
617 | cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen)); | |
b9c7a2bb SF |
618 | if (unlock_file == TRUE) |
619 | atomic_dec(&open_file->wrtPending); | |
620 | else | |
621 | CIFSSMBClose(xid, cifs_sb->tcon, fid); | |
622 | ||
7505e052 SF |
623 | FreeXid(xid); |
624 | return pntsd; | |
625 | } | |
626 | ||
97837582 SF |
627 | /* Set an ACL on the server */ |
628 | static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, | |
629 | struct inode *inode, const char *path) | |
630 | { | |
631 | struct cifsFileInfo *open_file; | |
632 | int unlock_file = FALSE; | |
633 | int xid; | |
634 | int rc = -EIO; | |
635 | __u16 fid; | |
636 | struct super_block *sb; | |
637 | struct cifs_sb_info *cifs_sb; | |
638 | ||
639 | #ifdef CONFIG_CIFS_DEBUG2 | |
640 | cFYI(1, ("set ACL for %s from mode 0x%x", path, inode->i_mode)); | |
641 | #endif | |
642 | ||
643 | if (!inode) | |
644 | return (rc); | |
645 | ||
646 | sb = inode->i_sb; | |
647 | if (sb == NULL) | |
648 | return (rc); | |
649 | ||
650 | cifs_sb = CIFS_SB(sb); | |
651 | xid = GetXid(); | |
652 | ||
653 | open_file = find_readable_file(CIFS_I(inode)); | |
654 | if (open_file) { | |
655 | unlock_file = TRUE; | |
656 | fid = open_file->netfid; | |
657 | } else { | |
658 | int oplock = FALSE; | |
659 | /* open file */ | |
660 | rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, | |
661 | WRITE_DAC, 0, &fid, &oplock, NULL, | |
662 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & | |
663 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
664 | if (rc != 0) { | |
665 | cERROR(1, ("Unable to open file to set ACL")); | |
666 | FreeXid(xid); | |
667 | return (rc); | |
668 | } | |
669 | } | |
670 | ||
671 | rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen); | |
672 | #ifdef CONFIG_CIFS_DEBUG2 | |
673 | cFYI(1, ("SetCIFSACL rc = %d", rc)); | |
674 | #endif | |
675 | if (unlock_file == TRUE) | |
676 | atomic_dec(&open_file->wrtPending); | |
677 | else | |
678 | CIFSSMBClose(xid, cifs_sb->tcon, fid); | |
679 | ||
680 | FreeXid(xid); | |
681 | ||
682 | return (rc); | |
683 | } | |
684 | ||
7505e052 SF |
685 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ |
686 | void acl_to_uid_mode(struct inode *inode, const char *path) | |
687 | { | |
688 | struct cifs_ntsd *pntsd = NULL; | |
689 | u32 acllen = 0; | |
690 | int rc = 0; | |
691 | ||
692 | #ifdef CONFIG_CIFS_DEBUG2 | |
693 | cFYI(1, ("converting ACL to mode for %s", path)); | |
694 | #endif | |
695 | pntsd = get_cifs_acl(&acllen, inode, path); | |
696 | ||
697 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ | |
698 | if (pntsd) | |
b9c7a2bb | 699 | rc = parse_sec_desc(pntsd, acllen, inode); |
7505e052 SF |
700 | if (rc) |
701 | cFYI(1, ("parse sec desc failed rc = %d", rc)); | |
702 | ||
b9c7a2bb | 703 | kfree(pntsd); |
b9c7a2bb SF |
704 | return; |
705 | } | |
953f8681 | 706 | |
7505e052 | 707 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
97837582 | 708 | int mode_to_acl(struct inode *inode, const char *path, __u64 nmode) |
953f8681 SF |
709 | { |
710 | int rc = 0; | |
711 | __u32 acllen = 0; | |
97837582 SF |
712 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
713 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ | |
953f8681 | 714 | |
97837582 | 715 | #ifdef CONFIG_CIFS_DEBUG2 |
953f8681 | 716 | cFYI(1, ("set ACL from mode for %s", path)); |
97837582 | 717 | #endif |
953f8681 SF |
718 | |
719 | /* Get the security descriptor */ | |
7505e052 | 720 | pntsd = get_cifs_acl(&acllen, inode, path); |
953f8681 | 721 | |
97837582 SF |
722 | /* Add three ACEs for owner, group, everyone getting rid of |
723 | other ACEs as chmod disables ACEs and set the security descriptor */ | |
953f8681 | 724 | |
97837582 SF |
725 | if (pntsd) { |
726 | /* allocate memory for the smb header, | |
727 | set security descriptor request security descriptor | |
728 | parameters, and secuirty descriptor itself */ | |
953f8681 | 729 | |
97837582 SF |
730 | pnntsd = kmalloc(acllen, GFP_KERNEL); |
731 | if (!pnntsd) { | |
732 | cERROR(1, ("Unable to allocate security descriptor")); | |
733 | kfree(pntsd); | |
734 | return (-ENOMEM); | |
735 | } | |
7505e052 | 736 | |
97837582 SF |
737 | rc = build_sec_desc(pntsd, pnntsd, acllen, inode, nmode); |
738 | ||
739 | #ifdef CONFIG_CIFS_DEBUG2 | |
740 | cFYI(1, ("build_sec_desc rc: %d", rc)); | |
741 | #endif | |
742 | ||
743 | if (!rc) { | |
744 | /* Set the security descriptor */ | |
745 | rc = set_cifs_acl(pnntsd, acllen, inode, path); | |
746 | #ifdef CONFIG_CIFS_DEBUG2 | |
747 | cFYI(1, ("set_cifs_acl rc: %d", rc)); | |
748 | #endif | |
749 | } | |
750 | ||
751 | kfree(pnntsd); | |
752 | kfree(pntsd); | |
753 | } | |
754 | ||
755 | return (rc); | |
953f8681 | 756 | } |
297647c2 | 757 | #endif /* CONFIG_CIFS_EXPERIMENTAL */ |