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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 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)); |
90c81e0b | 218 | cFYI(DBG2, ("all perms")); |
d61e5808 SF |
219 | return; |
220 | } | |
9b5e6857 AV |
221 | if ((flags & GENERIC_WRITE) || |
222 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 223 | *pmode |= (S_IWUGO & (*pbits_to_set)); |
9b5e6857 AV |
224 | if ((flags & GENERIC_READ) || |
225 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 226 | *pmode |= (S_IRUGO & (*pbits_to_set)); |
9b5e6857 AV |
227 | if ((flags & GENERIC_EXECUTE) || |
228 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 | 229 | *pmode |= (S_IXUGO & (*pbits_to_set)); |
630f3f0c | 230 | |
90c81e0b | 231 | cFYI(DBG2, ("access flags 0x%x mode now 0x%x", flags, *pmode)); |
630f3f0c SF |
232 | return; |
233 | } | |
234 | ||
ce06c9f0 SF |
235 | /* |
236 | Generate access flags to reflect permissions mode is the existing mode. | |
237 | This function is called for every ACE in the DACL whose SID matches | |
238 | with either owner or group or everyone. | |
239 | */ | |
240 | ||
241 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, | |
242 | __u32 *pace_flags) | |
243 | { | |
244 | /* reset access mask */ | |
245 | *pace_flags = 0x0; | |
246 | ||
247 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ | |
248 | mode &= bits_to_use; | |
249 | ||
250 | /* check for R/W/X UGO since we do not know whose flags | |
251 | is this but we have cleared all the bits sans RWX for | |
252 | either user or group or other as per bits_to_use */ | |
253 | if (mode & S_IRUGO) | |
254 | *pace_flags |= SET_FILE_READ_RIGHTS; | |
255 | if (mode & S_IWUGO) | |
256 | *pace_flags |= SET_FILE_WRITE_RIGHTS; | |
257 | if (mode & S_IXUGO) | |
258 | *pace_flags |= SET_FILE_EXEC_RIGHTS; | |
259 | ||
90c81e0b | 260 | cFYI(DBG2, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags)); |
ce06c9f0 SF |
261 | return; |
262 | } | |
263 | ||
97837582 SF |
264 | static __le16 fill_ace_for_sid(struct cifs_ace *pntace, |
265 | const struct cifs_sid *psid, __u64 nmode, umode_t bits) | |
266 | { | |
267 | int i; | |
268 | __u16 size = 0; | |
269 | __u32 access_req = 0; | |
270 | ||
271 | pntace->type = ACCESS_ALLOWED; | |
272 | pntace->flags = 0x0; | |
273 | mode_to_access_flags(nmode, bits, &access_req); | |
274 | if (!access_req) | |
275 | access_req = SET_MINIMUM_RIGHTS; | |
276 | pntace->access_req = cpu_to_le32(access_req); | |
277 | ||
278 | pntace->sid.revision = psid->revision; | |
279 | pntace->sid.num_subauth = psid->num_subauth; | |
280 | for (i = 0; i < 6; i++) | |
281 | pntace->sid.authority[i] = psid->authority[i]; | |
282 | for (i = 0; i < psid->num_subauth; i++) | |
283 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; | |
284 | ||
285 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); | |
286 | pntace->size = cpu_to_le16(size); | |
287 | ||
288 | return (size); | |
289 | } | |
290 | ||
297647c2 | 291 | |
953f8681 SF |
292 | #ifdef CONFIG_CIFS_DEBUG2 |
293 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) | |
d0d66c44 | 294 | { |
d0d66c44 | 295 | int num_subauth; |
d0d66c44 SP |
296 | |
297 | /* validate that we do not go past end of acl */ | |
297647c2 | 298 | |
44093ca2 SF |
299 | if (le16_to_cpu(pace->size) < 16) { |
300 | cERROR(1, ("ACE too small, %d", le16_to_cpu(pace->size))); | |
301 | return; | |
302 | } | |
303 | ||
304 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
d0d66c44 SP |
305 | cERROR(1, ("ACL too small to parse ACE")); |
306 | return; | |
44093ca2 | 307 | } |
d0d66c44 | 308 | |
44093ca2 | 309 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 310 | if (num_subauth) { |
8f18c131 | 311 | int i; |
44093ca2 SF |
312 | cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d", |
313 | pace->sid.revision, pace->sid.num_subauth, pace->type, | |
97837582 | 314 | pace->flags, le16_to_cpu(pace->size))); |
d12fd121 SF |
315 | for (i = 0; i < num_subauth; ++i) { |
316 | cFYI(1, ("ACE sub_auth[%d]: 0x%x", i, | |
44093ca2 | 317 | le32_to_cpu(pace->sid.sub_auth[i]))); |
d12fd121 SF |
318 | } |
319 | ||
320 | /* BB add length check to make sure that we do not have huge | |
321 | num auths and therefore go off the end */ | |
d12fd121 SF |
322 | } |
323 | ||
324 | return; | |
325 | } | |
953f8681 | 326 | #endif |
d12fd121 | 327 | |
d0d66c44 | 328 | |
a750e77c | 329 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 330 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
630f3f0c | 331 | struct inode *inode) |
d0d66c44 SP |
332 | { |
333 | int i; | |
334 | int num_aces = 0; | |
335 | int acl_size; | |
336 | char *acl_base; | |
d0d66c44 SP |
337 | struct cifs_ace **ppace; |
338 | ||
339 | /* BB need to add parm so we can store the SID BB */ | |
340 | ||
2b83457b SF |
341 | if (!pdacl) { |
342 | /* no DACL in the security descriptor, set | |
343 | all the permissions for user/group/other */ | |
344 | inode->i_mode |= S_IRWXUGO; | |
345 | return; | |
346 | } | |
347 | ||
d0d66c44 | 348 | /* validate that we do not go past end of acl */ |
af6f4612 | 349 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
d0d66c44 SP |
350 | cERROR(1, ("ACL too small to parse DACL")); |
351 | return; | |
352 | } | |
353 | ||
90c81e0b | 354 | cFYI(DBG2, ("DACL revision %d size %d num aces %d", |
af6f4612 SF |
355 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
356 | le32_to_cpu(pdacl->num_aces))); | |
d0d66c44 | 357 | |
7505e052 SF |
358 | /* reset rwx permissions for user/group/other. |
359 | Also, if num_aces is 0 i.e. DACL has no ACEs, | |
360 | user/group/other have no permissions */ | |
361 | inode->i_mode &= ~(S_IRWXUGO); | |
362 | ||
d0d66c44 SP |
363 | acl_base = (char *)pdacl; |
364 | acl_size = sizeof(struct cifs_acl); | |
365 | ||
adbc0358 | 366 | num_aces = le32_to_cpu(pdacl->num_aces); |
d0d66c44 | 367 | if (num_aces > 0) { |
15b03959 SF |
368 | umode_t user_mask = S_IRWXU; |
369 | umode_t group_mask = S_IRWXG; | |
370 | umode_t other_mask = S_IRWXO; | |
371 | ||
d0d66c44 SP |
372 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
373 | GFP_KERNEL); | |
374 | ||
d0d66c44 | 375 | for (i = 0; i < num_aces; ++i) { |
44093ca2 | 376 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
953f8681 SF |
377 | #ifdef CONFIG_CIFS_DEBUG2 |
378 | dump_ace(ppace[i], end_of_acl); | |
379 | #endif | |
e01b6400 SP |
380 | if (compare_sids(&(ppace[i]->sid), pownersid)) |
381 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
382 | ppace[i]->type, |
383 | &(inode->i_mode), | |
384 | &user_mask); | |
e01b6400 SP |
385 | if (compare_sids(&(ppace[i]->sid), pgrpsid)) |
386 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
387 | ppace[i]->type, |
388 | &(inode->i_mode), | |
389 | &group_mask); | |
e01b6400 SP |
390 | if (compare_sids(&(ppace[i]->sid), &sid_everyone)) |
391 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 SF |
392 | ppace[i]->type, |
393 | &(inode->i_mode), | |
394 | &other_mask); | |
e01b6400 | 395 | |
44093ca2 | 396 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
397 | (void *)ppace[i], |
398 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 399 | |
44093ca2 SF |
400 | acl_base = (char *)ppace[i]; |
401 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
402 | } |
403 | ||
404 | kfree(ppace); | |
d0d66c44 SP |
405 | } |
406 | ||
407 | return; | |
408 | } | |
409 | ||
bcb02034 | 410 | |
97837582 SF |
411 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
412 | struct cifs_sid *pgrpsid, __u64 nmode) | |
413 | { | |
414 | __le16 size = 0; | |
415 | struct cifs_acl *pnndacl; | |
416 | ||
417 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); | |
418 | ||
419 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), | |
420 | pownersid, nmode, S_IRWXU); | |
421 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
422 | pgrpsid, nmode, S_IRWXG); | |
423 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
424 | &sid_everyone, nmode, S_IRWXO); | |
425 | ||
426 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); | |
d9f382ef | 427 | pndacl->num_aces = cpu_to_le32(3); |
97837582 SF |
428 | |
429 | return (0); | |
430 | } | |
431 | ||
432 | ||
bcb02034 SF |
433 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
434 | { | |
435 | /* BB need to add parm so we can store the SID BB */ | |
436 | ||
b9c7a2bb SF |
437 | /* validate that we do not go past end of ACL - sid must be at least 8 |
438 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
439 | if (end_of_acl < (char *)psid + 8) { | |
440 | cERROR(1, ("ACL too small to parse SID %p", psid)); | |
bcb02034 SF |
441 | return -EINVAL; |
442 | } | |
d0d66c44 | 443 | |
af6f4612 | 444 | if (psid->num_subauth) { |
bcb02034 | 445 | #ifdef CONFIG_CIFS_DEBUG2 |
8f18c131 | 446 | int i; |
44093ca2 SF |
447 | cFYI(1, ("SID revision %d num_auth %d", |
448 | psid->revision, psid->num_subauth)); | |
bcb02034 | 449 | |
af6f4612 | 450 | for (i = 0; i < psid->num_subauth; i++) { |
d0d66c44 | 451 | cFYI(1, ("SID sub_auth[%d]: 0x%x ", i, |
297647c2 | 452 | le32_to_cpu(psid->sub_auth[i]))); |
d0d66c44 SP |
453 | } |
454 | ||
d12fd121 | 455 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 456 | num auths and therefore go off the end */ |
d12fd121 | 457 | cFYI(1, ("RID 0x%x", |
af6f4612 | 458 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1]))); |
bcb02034 | 459 | #endif |
d0d66c44 SP |
460 | } |
461 | ||
bcb02034 SF |
462 | return 0; |
463 | } | |
464 | ||
d0d66c44 | 465 | |
bcb02034 | 466 | /* Convert CIFS ACL to POSIX form */ |
630f3f0c SF |
467 | static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, |
468 | struct inode *inode) | |
bcb02034 | 469 | { |
d0d66c44 | 470 | int rc; |
bcb02034 SF |
471 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
472 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 | 473 | char *end_of_acl = ((char *)pntsd) + acl_len; |
7505e052 | 474 | __u32 dacloffset; |
bcb02034 | 475 | |
b9c7a2bb SF |
476 | if ((inode == NULL) || (pntsd == NULL)) |
477 | return -EIO; | |
478 | ||
bcb02034 | 479 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 480 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 481 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 482 | le32_to_cpu(pntsd->gsidoffset)); |
7505e052 | 483 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
63d2583f | 484 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
90c81e0b | 485 | cFYI(DBG2, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x " |
bcb02034 | 486 | "sacloffset 0x%x dacloffset 0x%x", |
af6f4612 SF |
487 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
488 | le32_to_cpu(pntsd->gsidoffset), | |
7505e052 | 489 | le32_to_cpu(pntsd->sacloffset), dacloffset)); |
b9c7a2bb | 490 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 SF |
491 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
492 | if (rc) | |
493 | return rc; | |
494 | ||
495 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
496 | if (rc) | |
497 | return rc; | |
498 | ||
7505e052 SF |
499 | if (dacloffset) |
500 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, | |
63d2583f | 501 | group_sid_ptr, inode); |
7505e052 SF |
502 | else |
503 | cFYI(1, ("no ACL")); /* BB grant all or default perms? */ | |
d0d66c44 | 504 | |
bcb02034 SF |
505 | /* cifscred->uid = owner_sid_ptr->rid; |
506 | cifscred->gid = group_sid_ptr->rid; | |
507 | memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr, | |
630f3f0c | 508 | sizeof(struct cifs_sid)); |
bcb02034 | 509 | memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr, |
630f3f0c | 510 | sizeof(struct cifs_sid)); */ |
bcb02034 | 511 | |
297647c2 | 512 | |
bcb02034 SF |
513 | return (0); |
514 | } | |
b9c7a2bb SF |
515 | |
516 | ||
97837582 SF |
517 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
518 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, | |
519 | int acl_len, struct inode *inode, __u64 nmode) | |
520 | { | |
521 | int rc = 0; | |
522 | __u32 dacloffset; | |
523 | __u32 ndacloffset; | |
524 | __u32 sidsoffset; | |
525 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
526 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ | |
527 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ | |
528 | ||
529 | if ((inode == NULL) || (pntsd == NULL) || (pnntsd == NULL)) | |
530 | return (-EIO); | |
531 | ||
532 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
533 | le32_to_cpu(pntsd->osidoffset)); | |
534 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
535 | le32_to_cpu(pntsd->gsidoffset)); | |
536 | ||
537 | dacloffset = le32_to_cpu(pntsd->dacloffset); | |
538 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); | |
539 | ||
540 | ndacloffset = sizeof(struct cifs_ntsd); | |
541 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); | |
542 | ndacl_ptr->revision = dacl_ptr->revision; | |
543 | ndacl_ptr->size = 0; | |
544 | ndacl_ptr->num_aces = 0; | |
545 | ||
546 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, nmode); | |
547 | ||
548 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); | |
549 | ||
550 | /* copy security descriptor control portion and owner and group sid */ | |
551 | copy_sec_desc(pntsd, pnntsd, sidsoffset); | |
552 | ||
553 | return (rc); | |
554 | } | |
555 | ||
556 | ||
7505e052 SF |
557 | /* Retrieve an ACL from the server */ |
558 | static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode, | |
8b1327f6 | 559 | const char *path, const __u16 *pfid) |
b9c7a2bb | 560 | { |
8b1327f6 | 561 | struct cifsFileInfo *open_file = NULL; |
b9c7a2bb SF |
562 | int unlock_file = FALSE; |
563 | int xid; | |
564 | int rc = -EIO; | |
565 | __u16 fid; | |
566 | struct super_block *sb; | |
567 | struct cifs_sb_info *cifs_sb; | |
568 | struct cifs_ntsd *pntsd = NULL; | |
b9c7a2bb SF |
569 | |
570 | cFYI(1, ("get mode from ACL for %s", path)); | |
571 | ||
572 | if (inode == NULL) | |
7505e052 | 573 | return NULL; |
b9c7a2bb SF |
574 | |
575 | xid = GetXid(); | |
8b1327f6 SF |
576 | if (pfid == NULL) |
577 | open_file = find_readable_file(CIFS_I(inode)); | |
578 | else | |
579 | fid = *pfid; | |
580 | ||
b9c7a2bb SF |
581 | sb = inode->i_sb; |
582 | if (sb == NULL) { | |
583 | FreeXid(xid); | |
7505e052 | 584 | return NULL; |
b9c7a2bb SF |
585 | } |
586 | cifs_sb = CIFS_SB(sb); | |
587 | ||
588 | if (open_file) { | |
589 | unlock_file = TRUE; | |
590 | fid = open_file->netfid; | |
8b1327f6 | 591 | } else if (pfid == NULL) { |
b9c7a2bb SF |
592 | int oplock = FALSE; |
593 | /* open file */ | |
594 | rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, | |
953f8681 | 595 | READ_CONTROL, 0, &fid, &oplock, NULL, |
b9c7a2bb SF |
596 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
597 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
598 | if (rc != 0) { | |
599 | cERROR(1, ("Unable to open file to get ACL")); | |
600 | FreeXid(xid); | |
7505e052 | 601 | return NULL; |
b9c7a2bb SF |
602 | } |
603 | } | |
604 | ||
7505e052 SF |
605 | rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen); |
606 | cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen)); | |
8b1327f6 | 607 | if (unlock_file == TRUE) /* find_readable_file increments ref count */ |
b9c7a2bb | 608 | atomic_dec(&open_file->wrtPending); |
8b1327f6 | 609 | else if (pfid == NULL) /* if opened above we have to close the handle */ |
b9c7a2bb | 610 | CIFSSMBClose(xid, cifs_sb->tcon, fid); |
8b1327f6 | 611 | /* else handle was passed in by caller */ |
b9c7a2bb | 612 | |
7505e052 SF |
613 | FreeXid(xid); |
614 | return pntsd; | |
615 | } | |
616 | ||
97837582 SF |
617 | /* Set an ACL on the server */ |
618 | static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, | |
619 | struct inode *inode, const char *path) | |
620 | { | |
621 | struct cifsFileInfo *open_file; | |
622 | int unlock_file = FALSE; | |
623 | int xid; | |
624 | int rc = -EIO; | |
625 | __u16 fid; | |
626 | struct super_block *sb; | |
627 | struct cifs_sb_info *cifs_sb; | |
628 | ||
90c81e0b | 629 | cFYI(DBG2, ("set ACL for %s from mode 0x%x", path, inode->i_mode)); |
97837582 SF |
630 | |
631 | if (!inode) | |
632 | return (rc); | |
633 | ||
634 | sb = inode->i_sb; | |
635 | if (sb == NULL) | |
636 | return (rc); | |
637 | ||
638 | cifs_sb = CIFS_SB(sb); | |
639 | xid = GetXid(); | |
640 | ||
641 | open_file = find_readable_file(CIFS_I(inode)); | |
642 | if (open_file) { | |
643 | unlock_file = TRUE; | |
644 | fid = open_file->netfid; | |
645 | } else { | |
646 | int oplock = FALSE; | |
647 | /* open file */ | |
648 | rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, | |
649 | WRITE_DAC, 0, &fid, &oplock, NULL, | |
650 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & | |
651 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
652 | if (rc != 0) { | |
653 | cERROR(1, ("Unable to open file to set ACL")); | |
654 | FreeXid(xid); | |
655 | return (rc); | |
656 | } | |
657 | } | |
658 | ||
659 | rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen); | |
90c81e0b | 660 | cFYI(DBG2, ("SetCIFSACL rc = %d", rc)); |
97837582 SF |
661 | if (unlock_file == TRUE) |
662 | atomic_dec(&open_file->wrtPending); | |
663 | else | |
664 | CIFSSMBClose(xid, cifs_sb->tcon, fid); | |
665 | ||
666 | FreeXid(xid); | |
667 | ||
668 | return (rc); | |
669 | } | |
670 | ||
7505e052 | 671 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ |
8b1327f6 | 672 | void acl_to_uid_mode(struct inode *inode, const char *path, const __u16 *pfid) |
7505e052 SF |
673 | { |
674 | struct cifs_ntsd *pntsd = NULL; | |
675 | u32 acllen = 0; | |
676 | int rc = 0; | |
677 | ||
90c81e0b | 678 | cFYI(DBG2, ("converting ACL to mode for %s", path)); |
8b1327f6 | 679 | pntsd = get_cifs_acl(&acllen, inode, path, pfid); |
7505e052 SF |
680 | |
681 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ | |
682 | if (pntsd) | |
b9c7a2bb | 683 | rc = parse_sec_desc(pntsd, acllen, inode); |
7505e052 SF |
684 | if (rc) |
685 | cFYI(1, ("parse sec desc failed rc = %d", rc)); | |
686 | ||
b9c7a2bb | 687 | kfree(pntsd); |
b9c7a2bb SF |
688 | return; |
689 | } | |
953f8681 | 690 | |
7505e052 | 691 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
97837582 | 692 | int mode_to_acl(struct inode *inode, const char *path, __u64 nmode) |
953f8681 SF |
693 | { |
694 | int rc = 0; | |
695 | __u32 acllen = 0; | |
97837582 SF |
696 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
697 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ | |
953f8681 | 698 | |
90c81e0b | 699 | cFYI(DBG2, ("set ACL from mode for %s", path)); |
953f8681 SF |
700 | |
701 | /* Get the security descriptor */ | |
8b1327f6 | 702 | pntsd = get_cifs_acl(&acllen, inode, path, NULL); |
953f8681 | 703 | |
97837582 SF |
704 | /* Add three ACEs for owner, group, everyone getting rid of |
705 | other ACEs as chmod disables ACEs and set the security descriptor */ | |
953f8681 | 706 | |
97837582 SF |
707 | if (pntsd) { |
708 | /* allocate memory for the smb header, | |
709 | set security descriptor request security descriptor | |
710 | parameters, and secuirty descriptor itself */ | |
953f8681 | 711 | |
97837582 SF |
712 | pnntsd = kmalloc(acllen, GFP_KERNEL); |
713 | if (!pnntsd) { | |
714 | cERROR(1, ("Unable to allocate security descriptor")); | |
715 | kfree(pntsd); | |
716 | return (-ENOMEM); | |
717 | } | |
7505e052 | 718 | |
97837582 SF |
719 | rc = build_sec_desc(pntsd, pnntsd, acllen, inode, nmode); |
720 | ||
90c81e0b | 721 | cFYI(DBG2, ("build_sec_desc rc: %d", rc)); |
97837582 SF |
722 | |
723 | if (!rc) { | |
724 | /* Set the security descriptor */ | |
725 | rc = set_cifs_acl(pnntsd, acllen, inode, path); | |
90c81e0b | 726 | cFYI(DBG2, ("set_cifs_acl rc: %d", rc)); |
97837582 SF |
727 | } |
728 | ||
729 | kfree(pnntsd); | |
730 | kfree(pntsd); | |
731 | } | |
732 | ||
733 | return (rc); | |
953f8681 | 734 | } |
297647c2 | 735 | #endif /* CONFIG_CIFS_EXPERIMENTAL */ |