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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> |
65874007 SF |
26 | #include "cifspdu.h" |
27 | #include "cifsglob.h" | |
d0d66c44 | 28 | #include "cifsacl.h" |
65874007 SF |
29 | #include "cifsproto.h" |
30 | #include "cifs_debug.h" | |
65874007 | 31 | |
297647c2 | 32 | |
af6f4612 | 33 | static struct cifs_wksid wksidarr[NUM_WK_SIDS] = { |
297647c2 SF |
34 | {{1, 0, {0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0} }, "null user"}, |
35 | {{1, 1, {0, 0, 0, 0, 0, 1}, {0, 0, 0, 0, 0} }, "nobody"}, | |
536abdb0 JL |
36 | {{1, 1, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(11), 0, 0, 0, 0} }, "net-users"}, |
37 | {{1, 1, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(18), 0, 0, 0, 0} }, "sys"}, | |
38 | {{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_cpu_to_le32(544), 0, 0, 0} }, "root"}, | |
39 | {{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_cpu_to_le32(545), 0, 0, 0} }, "users"}, | |
40 | {{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_cpu_to_le32(546), 0, 0, 0} }, "guest"} } | |
44093ca2 | 41 | ; |
297647c2 SF |
42 | |
43 | ||
2fbc2f17 | 44 | /* security id for everyone/world system group */ |
e01b6400 SP |
45 | static const struct cifs_sid sid_everyone = { |
46 | 1, 1, {0, 0, 0, 0, 0, 1}, {0} }; | |
2fbc2f17 SP |
47 | /* security id for Authenticated Users system group */ |
48 | static const struct cifs_sid sid_authusers = { | |
49 | 1, 1, {0, 0, 0, 0, 0, 5}, {11} }; | |
bcb02034 | 50 | /* group users */ |
ad7a2926 | 51 | static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} }; |
d0d66c44 | 52 | |
297647c2 SF |
53 | |
54 | int match_sid(struct cifs_sid *ctsid) | |
55 | { | |
56 | int i, j; | |
57 | int num_subauth, num_sat, num_saw; | |
58 | struct cifs_sid *cwsid; | |
59 | ||
60 | if (!ctsid) | |
ef571cad | 61 | return -1; |
297647c2 SF |
62 | |
63 | for (i = 0; i < NUM_WK_SIDS; ++i) { | |
64 | cwsid = &(wksidarr[i].cifssid); | |
65 | ||
66 | /* compare the revision */ | |
67 | if (ctsid->revision != cwsid->revision) | |
68 | continue; | |
69 | ||
70 | /* compare all of the six auth values */ | |
71 | for (j = 0; j < 6; ++j) { | |
72 | if (ctsid->authority[j] != cwsid->authority[j]) | |
73 | break; | |
74 | } | |
75 | if (j < 6) | |
76 | continue; /* all of the auth values did not match */ | |
77 | ||
78 | /* compare all of the subauth values if any */ | |
ce51ae14 DK |
79 | num_sat = ctsid->num_subauth; |
80 | num_saw = cwsid->num_subauth; | |
297647c2 SF |
81 | num_subauth = num_sat < num_saw ? num_sat : num_saw; |
82 | if (num_subauth) { | |
83 | for (j = 0; j < num_subauth; ++j) { | |
84 | if (ctsid->sub_auth[j] != cwsid->sub_auth[j]) | |
85 | break; | |
86 | } | |
87 | if (j < num_subauth) | |
88 | continue; /* all sub_auth values do not match */ | |
89 | } | |
90 | ||
b6b38f70 | 91 | cFYI(1, "matching sid: %s\n", wksidarr[i].sidname); |
ef571cad | 92 | return 0; /* sids compare/match */ |
297647c2 SF |
93 | } |
94 | ||
b6b38f70 | 95 | cFYI(1, "No matching sid"); |
ef571cad | 96 | return -1; |
297647c2 SF |
97 | } |
98 | ||
a750e77c SF |
99 | /* if the two SIDs (roughly equivalent to a UUID for a user or group) are |
100 | the same returns 1, if they do not match returns 0 */ | |
630f3f0c | 101 | int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) |
297647c2 SF |
102 | { |
103 | int i; | |
104 | int num_subauth, num_sat, num_saw; | |
105 | ||
106 | if ((!ctsid) || (!cwsid)) | |
ef571cad | 107 | return 0; |
297647c2 SF |
108 | |
109 | /* compare the revision */ | |
110 | if (ctsid->revision != cwsid->revision) | |
ef571cad | 111 | return 0; |
297647c2 SF |
112 | |
113 | /* compare all of the six auth values */ | |
114 | for (i = 0; i < 6; ++i) { | |
115 | if (ctsid->authority[i] != cwsid->authority[i]) | |
ef571cad | 116 | return 0; |
297647c2 SF |
117 | } |
118 | ||
119 | /* compare all of the subauth values if any */ | |
adbc0358 | 120 | num_sat = ctsid->num_subauth; |
adddd49d | 121 | num_saw = cwsid->num_subauth; |
297647c2 SF |
122 | num_subauth = num_sat < num_saw ? num_sat : num_saw; |
123 | if (num_subauth) { | |
124 | for (i = 0; i < num_subauth; ++i) { | |
125 | if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) | |
ef571cad | 126 | return 0; |
297647c2 SF |
127 | } |
128 | } | |
129 | ||
ef571cad | 130 | return 1; /* sids compare/match */ |
297647c2 SF |
131 | } |
132 | ||
97837582 SF |
133 | |
134 | /* copy ntsd, owner sid, and group sid from a security descriptor to another */ | |
135 | static void copy_sec_desc(const struct cifs_ntsd *pntsd, | |
136 | struct cifs_ntsd *pnntsd, __u32 sidsoffset) | |
137 | { | |
138 | int i; | |
139 | ||
140 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
141 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; | |
142 | ||
143 | /* copy security descriptor control portion */ | |
144 | pnntsd->revision = pntsd->revision; | |
145 | pnntsd->type = pntsd->type; | |
146 | pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); | |
147 | pnntsd->sacloffset = 0; | |
148 | pnntsd->osidoffset = cpu_to_le32(sidsoffset); | |
149 | pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); | |
150 | ||
151 | /* copy owner sid */ | |
152 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
153 | le32_to_cpu(pntsd->osidoffset)); | |
154 | nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); | |
155 | ||
156 | nowner_sid_ptr->revision = owner_sid_ptr->revision; | |
157 | nowner_sid_ptr->num_subauth = owner_sid_ptr->num_subauth; | |
158 | for (i = 0; i < 6; i++) | |
159 | nowner_sid_ptr->authority[i] = owner_sid_ptr->authority[i]; | |
160 | for (i = 0; i < 5; i++) | |
161 | nowner_sid_ptr->sub_auth[i] = owner_sid_ptr->sub_auth[i]; | |
162 | ||
163 | /* copy group sid */ | |
164 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
165 | le32_to_cpu(pntsd->gsidoffset)); | |
166 | ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + | |
167 | sizeof(struct cifs_sid)); | |
168 | ||
169 | ngroup_sid_ptr->revision = group_sid_ptr->revision; | |
170 | ngroup_sid_ptr->num_subauth = group_sid_ptr->num_subauth; | |
171 | for (i = 0; i < 6; i++) | |
172 | ngroup_sid_ptr->authority[i] = group_sid_ptr->authority[i]; | |
173 | for (i = 0; i < 5; i++) | |
b1910ad6 | 174 | ngroup_sid_ptr->sub_auth[i] = group_sid_ptr->sub_auth[i]; |
97837582 SF |
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) { | |
ad7a2926 | 198 | if (flags & GENERIC_ALL) |
15b03959 | 199 | *pbits_to_set &= ~S_IRWXUGO; |
ad7a2926 | 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) { | |
b6b38f70 | 212 | cERROR(1, "unknown access control type %d", type); |
15b03959 SF |
213 | return; |
214 | } | |
215 | /* else ACCESS_ALLOWED type */ | |
630f3f0c | 216 | |
9b5e6857 | 217 | if (flags & GENERIC_ALL) { |
15b03959 | 218 | *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
b6b38f70 | 219 | cFYI(DBG2, "all perms"); |
d61e5808 SF |
220 | return; |
221 | } | |
9b5e6857 AV |
222 | if ((flags & GENERIC_WRITE) || |
223 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
15b03959 | 224 | *pmode |= (S_IWUGO & (*pbits_to_set)); |
9b5e6857 AV |
225 | if ((flags & GENERIC_READ) || |
226 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
15b03959 | 227 | *pmode |= (S_IRUGO & (*pbits_to_set)); |
9b5e6857 AV |
228 | if ((flags & GENERIC_EXECUTE) || |
229 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
15b03959 | 230 | *pmode |= (S_IXUGO & (*pbits_to_set)); |
630f3f0c | 231 | |
b6b38f70 | 232 | cFYI(DBG2, "access flags 0x%x mode now 0x%x", flags, *pmode); |
630f3f0c SF |
233 | return; |
234 | } | |
235 | ||
ce06c9f0 SF |
236 | /* |
237 | Generate access flags to reflect permissions mode is the existing mode. | |
238 | This function is called for every ACE in the DACL whose SID matches | |
239 | with either owner or group or everyone. | |
240 | */ | |
241 | ||
242 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, | |
243 | __u32 *pace_flags) | |
244 | { | |
245 | /* reset access mask */ | |
246 | *pace_flags = 0x0; | |
247 | ||
248 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ | |
249 | mode &= bits_to_use; | |
250 | ||
251 | /* check for R/W/X UGO since we do not know whose flags | |
252 | is this but we have cleared all the bits sans RWX for | |
253 | either user or group or other as per bits_to_use */ | |
254 | if (mode & S_IRUGO) | |
255 | *pace_flags |= SET_FILE_READ_RIGHTS; | |
256 | if (mode & S_IWUGO) | |
257 | *pace_flags |= SET_FILE_WRITE_RIGHTS; | |
258 | if (mode & S_IXUGO) | |
259 | *pace_flags |= SET_FILE_EXEC_RIGHTS; | |
260 | ||
b6b38f70 | 261 | cFYI(DBG2, "mode: 0x%x, access flags now 0x%x", mode, *pace_flags); |
ce06c9f0 SF |
262 | return; |
263 | } | |
264 | ||
2b210adc | 265 | static __u16 fill_ace_for_sid(struct cifs_ace *pntace, |
97837582 SF |
266 | const struct cifs_sid *psid, __u64 nmode, umode_t bits) |
267 | { | |
268 | int i; | |
269 | __u16 size = 0; | |
270 | __u32 access_req = 0; | |
271 | ||
272 | pntace->type = ACCESS_ALLOWED; | |
273 | pntace->flags = 0x0; | |
274 | mode_to_access_flags(nmode, bits, &access_req); | |
275 | if (!access_req) | |
276 | access_req = SET_MINIMUM_RIGHTS; | |
277 | pntace->access_req = cpu_to_le32(access_req); | |
278 | ||
279 | pntace->sid.revision = psid->revision; | |
280 | pntace->sid.num_subauth = psid->num_subauth; | |
281 | for (i = 0; i < 6; i++) | |
282 | pntace->sid.authority[i] = psid->authority[i]; | |
283 | for (i = 0; i < psid->num_subauth; i++) | |
284 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; | |
285 | ||
286 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); | |
287 | pntace->size = cpu_to_le16(size); | |
288 | ||
ef571cad | 289 | return size; |
97837582 SF |
290 | } |
291 | ||
297647c2 | 292 | |
953f8681 SF |
293 | #ifdef CONFIG_CIFS_DEBUG2 |
294 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) | |
d0d66c44 | 295 | { |
d0d66c44 | 296 | int num_subauth; |
d0d66c44 SP |
297 | |
298 | /* validate that we do not go past end of acl */ | |
297647c2 | 299 | |
44093ca2 | 300 | if (le16_to_cpu(pace->size) < 16) { |
b6b38f70 | 301 | cERROR(1, "ACE too small %d", le16_to_cpu(pace->size)); |
44093ca2 SF |
302 | return; |
303 | } | |
304 | ||
305 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
b6b38f70 | 306 | cERROR(1, "ACL too small to parse ACE"); |
d0d66c44 | 307 | return; |
44093ca2 | 308 | } |
d0d66c44 | 309 | |
44093ca2 | 310 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 311 | if (num_subauth) { |
8f18c131 | 312 | int i; |
b6b38f70 | 313 | cFYI(1, "ACE revision %d num_auth %d type %d flags %d size %d", |
44093ca2 | 314 | pace->sid.revision, pace->sid.num_subauth, pace->type, |
b6b38f70 | 315 | pace->flags, le16_to_cpu(pace->size)); |
d12fd121 | 316 | for (i = 0; i < num_subauth; ++i) { |
b6b38f70 JP |
317 | cFYI(1, "ACE sub_auth[%d]: 0x%x", i, |
318 | le32_to_cpu(pace->sid.sub_auth[i])); | |
d12fd121 SF |
319 | } |
320 | ||
321 | /* BB add length check to make sure that we do not have huge | |
322 | num auths and therefore go off the end */ | |
d12fd121 SF |
323 | } |
324 | ||
325 | return; | |
326 | } | |
953f8681 | 327 | #endif |
d12fd121 | 328 | |
d0d66c44 | 329 | |
a750e77c | 330 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 331 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
0b8f18e3 | 332 | struct cifs_fattr *fattr) |
d0d66c44 SP |
333 | { |
334 | int i; | |
335 | int num_aces = 0; | |
336 | int acl_size; | |
337 | char *acl_base; | |
d0d66c44 SP |
338 | struct cifs_ace **ppace; |
339 | ||
340 | /* BB need to add parm so we can store the SID BB */ | |
341 | ||
2b83457b SF |
342 | if (!pdacl) { |
343 | /* no DACL in the security descriptor, set | |
344 | all the permissions for user/group/other */ | |
0b8f18e3 | 345 | fattr->cf_mode |= S_IRWXUGO; |
2b83457b SF |
346 | return; |
347 | } | |
348 | ||
d0d66c44 | 349 | /* validate that we do not go past end of acl */ |
af6f4612 | 350 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
b6b38f70 | 351 | cERROR(1, "ACL too small to parse DACL"); |
d0d66c44 SP |
352 | return; |
353 | } | |
354 | ||
b6b38f70 | 355 | cFYI(DBG2, "DACL revision %d size %d num aces %d", |
af6f4612 | 356 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
b6b38f70 | 357 | le32_to_cpu(pdacl->num_aces)); |
d0d66c44 | 358 | |
7505e052 SF |
359 | /* reset rwx permissions for user/group/other. |
360 | Also, if num_aces is 0 i.e. DACL has no ACEs, | |
361 | user/group/other have no permissions */ | |
0b8f18e3 | 362 | fattr->cf_mode &= ~(S_IRWXUGO); |
7505e052 | 363 | |
d0d66c44 SP |
364 | acl_base = (char *)pdacl; |
365 | acl_size = sizeof(struct cifs_acl); | |
366 | ||
adbc0358 | 367 | num_aces = le32_to_cpu(pdacl->num_aces); |
d0d66c44 | 368 | if (num_aces > 0) { |
15b03959 SF |
369 | umode_t user_mask = S_IRWXU; |
370 | umode_t group_mask = S_IRWXG; | |
2fbc2f17 | 371 | umode_t other_mask = S_IRWXU | S_IRWXG | S_IRWXO; |
15b03959 | 372 | |
d0d66c44 SP |
373 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
374 | GFP_KERNEL); | |
8132b65b SF |
375 | if (!ppace) { |
376 | cERROR(1, "DACL memory allocation error"); | |
377 | return; | |
378 | } | |
d0d66c44 | 379 | |
d0d66c44 | 380 | for (i = 0; i < num_aces; ++i) { |
44093ca2 | 381 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
953f8681 SF |
382 | #ifdef CONFIG_CIFS_DEBUG2 |
383 | dump_ace(ppace[i], end_of_acl); | |
384 | #endif | |
e01b6400 SP |
385 | if (compare_sids(&(ppace[i]->sid), pownersid)) |
386 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 | 387 | ppace[i]->type, |
0b8f18e3 | 388 | &fattr->cf_mode, |
15b03959 | 389 | &user_mask); |
e01b6400 SP |
390 | if (compare_sids(&(ppace[i]->sid), pgrpsid)) |
391 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 | 392 | ppace[i]->type, |
0b8f18e3 | 393 | &fattr->cf_mode, |
15b03959 | 394 | &group_mask); |
e01b6400 SP |
395 | if (compare_sids(&(ppace[i]->sid), &sid_everyone)) |
396 | access_flags_to_mode(ppace[i]->access_req, | |
15b03959 | 397 | ppace[i]->type, |
0b8f18e3 | 398 | &fattr->cf_mode, |
15b03959 | 399 | &other_mask); |
2fbc2f17 SP |
400 | if (compare_sids(&(ppace[i]->sid), &sid_authusers)) |
401 | access_flags_to_mode(ppace[i]->access_req, | |
402 | ppace[i]->type, | |
403 | &fattr->cf_mode, | |
404 | &other_mask); | |
405 | ||
e01b6400 | 406 | |
44093ca2 | 407 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
408 | (void *)ppace[i], |
409 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 410 | |
44093ca2 SF |
411 | acl_base = (char *)ppace[i]; |
412 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
413 | } |
414 | ||
415 | kfree(ppace); | |
d0d66c44 SP |
416 | } |
417 | ||
418 | return; | |
419 | } | |
420 | ||
bcb02034 | 421 | |
97837582 SF |
422 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
423 | struct cifs_sid *pgrpsid, __u64 nmode) | |
424 | { | |
2b210adc | 425 | u16 size = 0; |
97837582 SF |
426 | struct cifs_acl *pnndacl; |
427 | ||
428 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); | |
429 | ||
430 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), | |
431 | pownersid, nmode, S_IRWXU); | |
432 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
433 | pgrpsid, nmode, S_IRWXG); | |
434 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), | |
435 | &sid_everyone, nmode, S_IRWXO); | |
436 | ||
437 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); | |
d9f382ef | 438 | pndacl->num_aces = cpu_to_le32(3); |
97837582 | 439 | |
ef571cad | 440 | return 0; |
97837582 SF |
441 | } |
442 | ||
443 | ||
bcb02034 SF |
444 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
445 | { | |
446 | /* BB need to add parm so we can store the SID BB */ | |
447 | ||
b9c7a2bb SF |
448 | /* validate that we do not go past end of ACL - sid must be at least 8 |
449 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
450 | if (end_of_acl < (char *)psid + 8) { | |
b6b38f70 | 451 | cERROR(1, "ACL too small to parse SID %p", psid); |
bcb02034 SF |
452 | return -EINVAL; |
453 | } | |
d0d66c44 | 454 | |
af6f4612 | 455 | if (psid->num_subauth) { |
bcb02034 | 456 | #ifdef CONFIG_CIFS_DEBUG2 |
8f18c131 | 457 | int i; |
b6b38f70 JP |
458 | cFYI(1, "SID revision %d num_auth %d", |
459 | psid->revision, psid->num_subauth); | |
bcb02034 | 460 | |
af6f4612 | 461 | for (i = 0; i < psid->num_subauth; i++) { |
b6b38f70 JP |
462 | cFYI(1, "SID sub_auth[%d]: 0x%x ", i, |
463 | le32_to_cpu(psid->sub_auth[i])); | |
d0d66c44 SP |
464 | } |
465 | ||
d12fd121 | 466 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 467 | num auths and therefore go off the end */ |
b6b38f70 JP |
468 | cFYI(1, "RID 0x%x", |
469 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1])); | |
bcb02034 | 470 | #endif |
d0d66c44 SP |
471 | } |
472 | ||
bcb02034 SF |
473 | return 0; |
474 | } | |
475 | ||
d0d66c44 | 476 | |
bcb02034 | 477 | /* Convert CIFS ACL to POSIX form */ |
630f3f0c | 478 | static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, |
0b8f18e3 | 479 | struct cifs_fattr *fattr) |
bcb02034 | 480 | { |
d0d66c44 | 481 | int rc; |
bcb02034 SF |
482 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
483 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 | 484 | char *end_of_acl = ((char *)pntsd) + acl_len; |
7505e052 | 485 | __u32 dacloffset; |
bcb02034 | 486 | |
0b8f18e3 | 487 | if (pntsd == NULL) |
b9c7a2bb SF |
488 | return -EIO; |
489 | ||
bcb02034 | 490 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 491 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 492 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 493 | le32_to_cpu(pntsd->gsidoffset)); |
7505e052 | 494 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
63d2583f | 495 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
b6b38f70 | 496 | cFYI(DBG2, "revision %d type 0x%x ooffset 0x%x goffset 0x%x " |
bcb02034 | 497 | "sacloffset 0x%x dacloffset 0x%x", |
af6f4612 SF |
498 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
499 | le32_to_cpu(pntsd->gsidoffset), | |
b6b38f70 | 500 | le32_to_cpu(pntsd->sacloffset), dacloffset); |
b9c7a2bb | 501 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 SF |
502 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
503 | if (rc) | |
504 | return rc; | |
505 | ||
506 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
507 | if (rc) | |
508 | return rc; | |
509 | ||
7505e052 SF |
510 | if (dacloffset) |
511 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, | |
0b8f18e3 | 512 | group_sid_ptr, fattr); |
7505e052 | 513 | else |
b6b38f70 | 514 | cFYI(1, "no ACL"); /* BB grant all or default perms? */ |
d0d66c44 | 515 | |
bcb02034 SF |
516 | /* cifscred->uid = owner_sid_ptr->rid; |
517 | cifscred->gid = group_sid_ptr->rid; | |
518 | memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr, | |
630f3f0c | 519 | sizeof(struct cifs_sid)); |
bcb02034 | 520 | memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr, |
630f3f0c | 521 | sizeof(struct cifs_sid)); */ |
bcb02034 | 522 | |
ef571cad | 523 | return 0; |
bcb02034 | 524 | } |
b9c7a2bb SF |
525 | |
526 | ||
97837582 SF |
527 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
528 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, | |
cce246ee | 529 | struct inode *inode, __u64 nmode) |
97837582 SF |
530 | { |
531 | int rc = 0; | |
532 | __u32 dacloffset; | |
533 | __u32 ndacloffset; | |
534 | __u32 sidsoffset; | |
535 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; | |
536 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ | |
537 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ | |
538 | ||
539 | if ((inode == NULL) || (pntsd == NULL) || (pnntsd == NULL)) | |
ef571cad | 540 | return -EIO; |
97837582 SF |
541 | |
542 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
543 | le32_to_cpu(pntsd->osidoffset)); | |
544 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
545 | le32_to_cpu(pntsd->gsidoffset)); | |
546 | ||
547 | dacloffset = le32_to_cpu(pntsd->dacloffset); | |
548 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); | |
549 | ||
550 | ndacloffset = sizeof(struct cifs_ntsd); | |
551 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); | |
552 | ndacl_ptr->revision = dacl_ptr->revision; | |
553 | ndacl_ptr->size = 0; | |
554 | ndacl_ptr->num_aces = 0; | |
555 | ||
556 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, nmode); | |
557 | ||
558 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); | |
559 | ||
560 | /* copy security descriptor control portion and owner and group sid */ | |
561 | copy_sec_desc(pntsd, pnntsd, sidsoffset); | |
562 | ||
ef571cad | 563 | return rc; |
97837582 SF |
564 | } |
565 | ||
1bf4072d CH |
566 | static struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, |
567 | __u16 fid, u32 *pacllen) | |
b9c7a2bb | 568 | { |
b9c7a2bb | 569 | struct cifs_ntsd *pntsd = NULL; |
1bf4072d | 570 | int xid, rc; |
7ffec372 JL |
571 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
572 | ||
573 | if (IS_ERR(tlink)) | |
987b21d7 | 574 | return ERR_CAST(tlink); |
b9c7a2bb | 575 | |
1bf4072d | 576 | xid = GetXid(); |
7ffec372 | 577 | rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), fid, &pntsd, pacllen); |
1bf4072d | 578 | FreeXid(xid); |
b9c7a2bb | 579 | |
7ffec372 | 580 | cifs_put_tlink(tlink); |
b9c7a2bb | 581 | |
987b21d7 SP |
582 | cFYI(1, "%s: rc = %d ACL len %d", __func__, rc, *pacllen); |
583 | if (rc) | |
584 | return ERR_PTR(rc); | |
1bf4072d CH |
585 | return pntsd; |
586 | } | |
8b1327f6 | 587 | |
1bf4072d CH |
588 | static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, |
589 | const char *path, u32 *pacllen) | |
590 | { | |
591 | struct cifs_ntsd *pntsd = NULL; | |
592 | int oplock = 0; | |
593 | int xid, rc; | |
594 | __u16 fid; | |
7ffec372 JL |
595 | struct cifsTconInfo *tcon; |
596 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); | |
597 | ||
598 | if (IS_ERR(tlink)) | |
987b21d7 | 599 | return ERR_CAST(tlink); |
b9c7a2bb | 600 | |
7ffec372 | 601 | tcon = tlink_tcon(tlink); |
1bf4072d CH |
602 | xid = GetXid(); |
603 | ||
7ffec372 | 604 | rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, READ_CONTROL, 0, |
1bf4072d CH |
605 | &fid, &oplock, NULL, cifs_sb->local_nls, |
606 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
987b21d7 SP |
607 | if (!rc) { |
608 | rc = CIFSSMBGetCIFSACL(xid, tcon, fid, &pntsd, pacllen); | |
609 | CIFSSMBClose(xid, tcon, fid); | |
b9c7a2bb SF |
610 | } |
611 | ||
7ffec372 | 612 | cifs_put_tlink(tlink); |
7505e052 | 613 | FreeXid(xid); |
987b21d7 SP |
614 | |
615 | cFYI(1, "%s: rc = %d ACL len %d", __func__, rc, *pacllen); | |
616 | if (rc) | |
617 | return ERR_PTR(rc); | |
7505e052 SF |
618 | return pntsd; |
619 | } | |
620 | ||
1bf4072d | 621 | /* Retrieve an ACL from the server */ |
fbeba8bb | 622 | struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb, |
1bf4072d CH |
623 | struct inode *inode, const char *path, |
624 | u32 *pacllen) | |
625 | { | |
626 | struct cifs_ntsd *pntsd = NULL; | |
627 | struct cifsFileInfo *open_file = NULL; | |
628 | ||
629 | if (inode) | |
6508d904 | 630 | open_file = find_readable_file(CIFS_I(inode), true); |
1bf4072d CH |
631 | if (!open_file) |
632 | return get_cifs_acl_by_path(cifs_sb, path, pacllen); | |
633 | ||
634 | pntsd = get_cifs_acl_by_fid(cifs_sb, open_file->netfid, pacllen); | |
6ab409b5 | 635 | cifsFileInfo_put(open_file); |
1bf4072d CH |
636 | return pntsd; |
637 | } | |
638 | ||
b96d31a6 CH |
639 | static int set_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, __u16 fid, |
640 | struct cifs_ntsd *pnntsd, u32 acllen) | |
97837582 | 641 | { |
b96d31a6 | 642 | int xid, rc; |
7ffec372 JL |
643 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
644 | ||
645 | if (IS_ERR(tlink)) | |
646 | return PTR_ERR(tlink); | |
97837582 | 647 | |
b96d31a6 | 648 | xid = GetXid(); |
7ffec372 | 649 | rc = CIFSSMBSetCIFSACL(xid, tlink_tcon(tlink), fid, pnntsd, acllen); |
b96d31a6 | 650 | FreeXid(xid); |
7ffec372 | 651 | cifs_put_tlink(tlink); |
97837582 | 652 | |
b6b38f70 | 653 | cFYI(DBG2, "SetCIFSACL rc = %d", rc); |
b96d31a6 CH |
654 | return rc; |
655 | } | |
97837582 | 656 | |
b96d31a6 CH |
657 | static int set_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, const char *path, |
658 | struct cifs_ntsd *pnntsd, u32 acllen) | |
659 | { | |
660 | int oplock = 0; | |
661 | int xid, rc; | |
662 | __u16 fid; | |
7ffec372 JL |
663 | struct cifsTconInfo *tcon; |
664 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); | |
97837582 | 665 | |
7ffec372 JL |
666 | if (IS_ERR(tlink)) |
667 | return PTR_ERR(tlink); | |
668 | ||
669 | tcon = tlink_tcon(tlink); | |
97837582 SF |
670 | xid = GetXid(); |
671 | ||
7ffec372 | 672 | rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, WRITE_DAC, 0, |
b96d31a6 CH |
673 | &fid, &oplock, NULL, cifs_sb->local_nls, |
674 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
675 | if (rc) { | |
b6b38f70 | 676 | cERROR(1, "Unable to open file to set ACL"); |
b96d31a6 | 677 | goto out; |
97837582 SF |
678 | } |
679 | ||
7ffec372 | 680 | rc = CIFSSMBSetCIFSACL(xid, tcon, fid, pnntsd, acllen); |
b6b38f70 | 681 | cFYI(DBG2, "SetCIFSACL rc = %d", rc); |
97837582 | 682 | |
7ffec372 JL |
683 | CIFSSMBClose(xid, tcon, fid); |
684 | out: | |
97837582 | 685 | FreeXid(xid); |
7ffec372 | 686 | cifs_put_tlink(tlink); |
b96d31a6 CH |
687 | return rc; |
688 | } | |
97837582 | 689 | |
b96d31a6 CH |
690 | /* Set an ACL on the server */ |
691 | static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, | |
692 | struct inode *inode, const char *path) | |
693 | { | |
694 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
695 | struct cifsFileInfo *open_file; | |
696 | int rc; | |
697 | ||
b6b38f70 | 698 | cFYI(DBG2, "set ACL for %s from mode 0x%x", path, inode->i_mode); |
b96d31a6 | 699 | |
6508d904 | 700 | open_file = find_readable_file(CIFS_I(inode), true); |
b96d31a6 CH |
701 | if (!open_file) |
702 | return set_cifs_acl_by_path(cifs_sb, path, pnntsd, acllen); | |
703 | ||
704 | rc = set_cifs_acl_by_fid(cifs_sb, open_file->netfid, pnntsd, acllen); | |
6ab409b5 | 705 | cifsFileInfo_put(open_file); |
ef571cad | 706 | return rc; |
97837582 SF |
707 | } |
708 | ||
7505e052 | 709 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ |
987b21d7 | 710 | int |
0b8f18e3 JL |
711 | cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, |
712 | struct inode *inode, const char *path, const __u16 *pfid) | |
7505e052 SF |
713 | { |
714 | struct cifs_ntsd *pntsd = NULL; | |
715 | u32 acllen = 0; | |
716 | int rc = 0; | |
717 | ||
b6b38f70 | 718 | cFYI(DBG2, "converting ACL to mode for %s", path); |
1bf4072d CH |
719 | |
720 | if (pfid) | |
721 | pntsd = get_cifs_acl_by_fid(cifs_sb, *pfid, &acllen); | |
722 | else | |
723 | pntsd = get_cifs_acl(cifs_sb, inode, path, &acllen); | |
7505e052 SF |
724 | |
725 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ | |
987b21d7 SP |
726 | if (IS_ERR(pntsd)) { |
727 | rc = PTR_ERR(pntsd); | |
728 | cERROR(1, "%s: error %d getting sec desc", __func__, rc); | |
729 | } else { | |
0b8f18e3 | 730 | rc = parse_sec_desc(pntsd, acllen, fattr); |
987b21d7 SP |
731 | kfree(pntsd); |
732 | if (rc) | |
733 | cERROR(1, "parse sec desc failed rc = %d", rc); | |
734 | } | |
7505e052 | 735 | |
987b21d7 | 736 | return rc; |
b9c7a2bb | 737 | } |
953f8681 | 738 | |
7505e052 | 739 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
78415d2d | 740 | int mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode) |
953f8681 SF |
741 | { |
742 | int rc = 0; | |
cce246ee | 743 | __u32 secdesclen = 0; |
97837582 SF |
744 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
745 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ | |
953f8681 | 746 | |
b6b38f70 | 747 | cFYI(DBG2, "set ACL from mode for %s", path); |
953f8681 SF |
748 | |
749 | /* Get the security descriptor */ | |
1bf4072d | 750 | pntsd = get_cifs_acl(CIFS_SB(inode->i_sb), inode, path, &secdesclen); |
953f8681 | 751 | |
97837582 SF |
752 | /* Add three ACEs for owner, group, everyone getting rid of |
753 | other ACEs as chmod disables ACEs and set the security descriptor */ | |
953f8681 | 754 | |
987b21d7 SP |
755 | if (IS_ERR(pntsd)) { |
756 | rc = PTR_ERR(pntsd); | |
757 | cERROR(1, "%s: error %d getting sec desc", __func__, rc); | |
758 | } else { | |
97837582 SF |
759 | /* allocate memory for the smb header, |
760 | set security descriptor request security descriptor | |
761 | parameters, and secuirty descriptor itself */ | |
953f8681 | 762 | |
cce246ee SF |
763 | secdesclen = secdesclen < DEFSECDESCLEN ? |
764 | DEFSECDESCLEN : secdesclen; | |
765 | pnntsd = kmalloc(secdesclen, GFP_KERNEL); | |
97837582 | 766 | if (!pnntsd) { |
b6b38f70 | 767 | cERROR(1, "Unable to allocate security descriptor"); |
97837582 | 768 | kfree(pntsd); |
ef571cad | 769 | return -ENOMEM; |
97837582 | 770 | } |
7505e052 | 771 | |
cce246ee | 772 | rc = build_sec_desc(pntsd, pnntsd, inode, nmode); |
97837582 | 773 | |
b6b38f70 | 774 | cFYI(DBG2, "build_sec_desc rc: %d", rc); |
97837582 SF |
775 | |
776 | if (!rc) { | |
777 | /* Set the security descriptor */ | |
cce246ee | 778 | rc = set_cifs_acl(pnntsd, secdesclen, inode, path); |
b6b38f70 | 779 | cFYI(DBG2, "set_cifs_acl rc: %d", rc); |
97837582 SF |
780 | } |
781 | ||
782 | kfree(pnntsd); | |
783 | kfree(pntsd); | |
784 | } | |
785 | ||
ef571cad | 786 | return rc; |
953f8681 | 787 | } |