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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 | ||
630f3f0c SF |
132 | /* |
133 | change posix mode to reflect permissions | |
134 | pmode is the existing mode (we only want to overwrite part of this | |
135 | bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 | |
136 | */ | |
d61e5808 | 137 | static void access_flags_to_mode(__u32 ace_flags, umode_t *pmode, |
630f3f0c SF |
138 | umode_t bits_to_set) |
139 | { | |
140 | ||
d61e5808 SF |
141 | if (ace_flags & GENERIC_ALL) { |
142 | *pmode |= (S_IRWXUGO & bits_to_set); | |
630f3f0c | 143 | #ifdef CONFIG_CIFS_DEBUG2 |
d61e5808 | 144 | cFYI(1, ("all perms")); |
630f3f0c | 145 | #endif |
d61e5808 SF |
146 | return; |
147 | } | |
e01b6400 SP |
148 | if ((ace_flags & GENERIC_WRITE) || |
149 | ((ace_flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) | |
d61e5808 | 150 | *pmode |= (S_IWUGO & bits_to_set); |
e01b6400 SP |
151 | if ((ace_flags & GENERIC_READ) || |
152 | ((ace_flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) | |
d61e5808 | 153 | *pmode |= (S_IRUGO & bits_to_set); |
e01b6400 SP |
154 | if ((ace_flags & GENERIC_EXECUTE) || |
155 | ((ace_flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) | |
d61e5808 | 156 | *pmode |= (S_IXUGO & bits_to_set); |
630f3f0c | 157 | |
d61e5808 | 158 | #ifdef CONFIG_CIFS_DEBUG2 |
b9c7a2bb | 159 | cFYI(1, ("access flags 0x%x mode now 0x%x", ace_flags, *pmode)); |
d61e5808 | 160 | #endif |
630f3f0c SF |
161 | return; |
162 | } | |
163 | ||
297647c2 | 164 | |
d12fd121 | 165 | static void parse_ace(struct cifs_ace *pace, char *end_of_acl) |
d0d66c44 | 166 | { |
d0d66c44 | 167 | int num_subauth; |
d0d66c44 SP |
168 | |
169 | /* validate that we do not go past end of acl */ | |
297647c2 | 170 | |
44093ca2 SF |
171 | if (le16_to_cpu(pace->size) < 16) { |
172 | cERROR(1, ("ACE too small, %d", le16_to_cpu(pace->size))); | |
173 | return; | |
174 | } | |
175 | ||
176 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { | |
d0d66c44 SP |
177 | cERROR(1, ("ACL too small to parse ACE")); |
178 | return; | |
44093ca2 | 179 | } |
d0d66c44 | 180 | |
44093ca2 | 181 | num_subauth = pace->sid.num_subauth; |
d0d66c44 | 182 | if (num_subauth) { |
d12fd121 | 183 | #ifdef CONFIG_CIFS_DEBUG2 |
8f18c131 | 184 | int i; |
44093ca2 SF |
185 | cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d", |
186 | pace->sid.revision, pace->sid.num_subauth, pace->type, | |
187 | pace->flags, pace->size)); | |
d12fd121 SF |
188 | for (i = 0; i < num_subauth; ++i) { |
189 | cFYI(1, ("ACE sub_auth[%d]: 0x%x", i, | |
44093ca2 | 190 | le32_to_cpu(pace->sid.sub_auth[i]))); |
d12fd121 SF |
191 | } |
192 | ||
193 | /* BB add length check to make sure that we do not have huge | |
194 | num auths and therefore go off the end */ | |
d12fd121 SF |
195 | #endif |
196 | } | |
197 | ||
198 | return; | |
199 | } | |
200 | ||
d0d66c44 | 201 | |
a750e77c | 202 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d61e5808 | 203 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
630f3f0c | 204 | struct inode *inode) |
d0d66c44 SP |
205 | { |
206 | int i; | |
207 | int num_aces = 0; | |
208 | int acl_size; | |
209 | char *acl_base; | |
d0d66c44 SP |
210 | struct cifs_ace **ppace; |
211 | ||
212 | /* BB need to add parm so we can store the SID BB */ | |
213 | ||
214 | /* validate that we do not go past end of acl */ | |
af6f4612 | 215 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
d0d66c44 SP |
216 | cERROR(1, ("ACL too small to parse DACL")); |
217 | return; | |
218 | } | |
219 | ||
220 | #ifdef CONFIG_CIFS_DEBUG2 | |
221 | cFYI(1, ("DACL revision %d size %d num aces %d", | |
af6f4612 SF |
222 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
223 | le32_to_cpu(pdacl->num_aces))); | |
d0d66c44 SP |
224 | #endif |
225 | ||
226 | acl_base = (char *)pdacl; | |
227 | acl_size = sizeof(struct cifs_acl); | |
228 | ||
adbc0358 | 229 | num_aces = le32_to_cpu(pdacl->num_aces); |
d0d66c44 | 230 | if (num_aces > 0) { |
d0d66c44 SP |
231 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
232 | GFP_KERNEL); | |
233 | ||
d12fd121 | 234 | /* cifscred->cecount = pdacl->num_aces; |
d12fd121 SF |
235 | cifscred->aces = kmalloc(num_aces * |
236 | sizeof(struct cifs_ace *), GFP_KERNEL);*/ | |
d0d66c44 | 237 | |
e01b6400 SP |
238 | /* reset rwx permissions for user/group/other */ |
239 | inode->i_mode &= ~(S_IRWXUGO); | |
240 | ||
d0d66c44 | 241 | for (i = 0; i < num_aces; ++i) { |
44093ca2 SF |
242 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
243 | ||
244 | parse_ace(ppace[i], end_of_acl); | |
d0d66c44 | 245 | |
e01b6400 SP |
246 | if (compare_sids(&(ppace[i]->sid), pownersid)) |
247 | access_flags_to_mode(ppace[i]->access_req, | |
248 | &(inode->i_mode), S_IRWXU); | |
249 | if (compare_sids(&(ppace[i]->sid), pgrpsid)) | |
250 | access_flags_to_mode(ppace[i]->access_req, | |
251 | &(inode->i_mode), S_IRWXG); | |
252 | if (compare_sids(&(ppace[i]->sid), &sid_everyone)) | |
253 | access_flags_to_mode(ppace[i]->access_req, | |
254 | &(inode->i_mode), S_IRWXO); | |
255 | ||
44093ca2 | 256 | /* memcpy((void *)(&(cifscred->aces[i])), |
d12fd121 SF |
257 | (void *)ppace[i], |
258 | sizeof(struct cifs_ace)); */ | |
d0d66c44 | 259 | |
44093ca2 SF |
260 | acl_base = (char *)ppace[i]; |
261 | acl_size = le16_to_cpu(ppace[i]->size); | |
d0d66c44 SP |
262 | } |
263 | ||
264 | kfree(ppace); | |
d0d66c44 SP |
265 | } |
266 | ||
267 | return; | |
268 | } | |
269 | ||
bcb02034 SF |
270 | |
271 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) | |
272 | { | |
273 | /* BB need to add parm so we can store the SID BB */ | |
274 | ||
b9c7a2bb SF |
275 | /* validate that we do not go past end of ACL - sid must be at least 8 |
276 | bytes long (assuming no sub-auths - e.g. the null SID */ | |
277 | if (end_of_acl < (char *)psid + 8) { | |
278 | cERROR(1, ("ACL too small to parse SID %p", psid)); | |
bcb02034 SF |
279 | return -EINVAL; |
280 | } | |
d0d66c44 | 281 | |
af6f4612 | 282 | if (psid->num_subauth) { |
bcb02034 | 283 | #ifdef CONFIG_CIFS_DEBUG2 |
8f18c131 | 284 | int i; |
44093ca2 SF |
285 | cFYI(1, ("SID revision %d num_auth %d", |
286 | psid->revision, psid->num_subauth)); | |
bcb02034 | 287 | |
af6f4612 | 288 | for (i = 0; i < psid->num_subauth; i++) { |
d0d66c44 | 289 | cFYI(1, ("SID sub_auth[%d]: 0x%x ", i, |
297647c2 | 290 | le32_to_cpu(psid->sub_auth[i]))); |
d0d66c44 SP |
291 | } |
292 | ||
d12fd121 | 293 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 294 | num auths and therefore go off the end */ |
d12fd121 | 295 | cFYI(1, ("RID 0x%x", |
af6f4612 | 296 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1]))); |
bcb02034 | 297 | #endif |
d0d66c44 SP |
298 | } |
299 | ||
bcb02034 SF |
300 | return 0; |
301 | } | |
302 | ||
d0d66c44 | 303 | |
bcb02034 | 304 | /* Convert CIFS ACL to POSIX form */ |
630f3f0c SF |
305 | static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, |
306 | struct inode *inode) | |
bcb02034 | 307 | { |
d0d66c44 | 308 | int rc; |
bcb02034 SF |
309 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
310 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 SF |
311 | char *end_of_acl = ((char *)pntsd) + acl_len; |
312 | ||
b9c7a2bb SF |
313 | if ((inode == NULL) || (pntsd == NULL)) |
314 | return -EIO; | |
315 | ||
bcb02034 | 316 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 317 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 318 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 319 | le32_to_cpu(pntsd->gsidoffset)); |
bcb02034 | 320 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + |
af6f4612 | 321 | le32_to_cpu(pntsd->dacloffset)); |
bcb02034 SF |
322 | #ifdef CONFIG_CIFS_DEBUG2 |
323 | cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x " | |
324 | "sacloffset 0x%x dacloffset 0x%x", | |
af6f4612 SF |
325 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
326 | le32_to_cpu(pntsd->gsidoffset), | |
327 | le32_to_cpu(pntsd->sacloffset), | |
ce51ae14 | 328 | le32_to_cpu(pntsd->dacloffset))); |
bcb02034 | 329 | #endif |
b9c7a2bb | 330 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
bcb02034 SF |
331 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
332 | if (rc) | |
333 | return rc; | |
334 | ||
335 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
336 | if (rc) | |
337 | return rc; | |
338 | ||
630f3f0c | 339 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, group_sid_ptr, inode); |
d0d66c44 | 340 | |
bcb02034 SF |
341 | /* cifscred->uid = owner_sid_ptr->rid; |
342 | cifscred->gid = group_sid_ptr->rid; | |
343 | memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr, | |
630f3f0c | 344 | sizeof(struct cifs_sid)); |
bcb02034 | 345 | memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr, |
630f3f0c | 346 | sizeof(struct cifs_sid)); */ |
bcb02034 | 347 | |
297647c2 | 348 | |
bcb02034 SF |
349 | return (0); |
350 | } | |
b9c7a2bb SF |
351 | |
352 | ||
353 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ | |
354 | ||
355 | void acl_to_uid_mode(struct inode *inode, const char *path) | |
356 | { | |
357 | struct cifsFileInfo *open_file; | |
358 | int unlock_file = FALSE; | |
359 | int xid; | |
360 | int rc = -EIO; | |
361 | __u16 fid; | |
362 | struct super_block *sb; | |
363 | struct cifs_sb_info *cifs_sb; | |
364 | struct cifs_ntsd *pntsd = NULL; | |
365 | __u32 acllen; | |
366 | ||
367 | cFYI(1, ("get mode from ACL for %s", path)); | |
368 | ||
369 | if (inode == NULL) | |
370 | return; | |
371 | ||
372 | xid = GetXid(); | |
373 | open_file = find_readable_file(CIFS_I(inode)); | |
374 | sb = inode->i_sb; | |
375 | if (sb == NULL) { | |
376 | FreeXid(xid); | |
377 | return; | |
378 | } | |
379 | cifs_sb = CIFS_SB(sb); | |
380 | ||
381 | if (open_file) { | |
382 | unlock_file = TRUE; | |
383 | fid = open_file->netfid; | |
384 | } else { | |
385 | int oplock = FALSE; | |
386 | /* open file */ | |
387 | rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, | |
388 | GENERIC_READ, 0, &fid, &oplock, NULL, | |
389 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & | |
390 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
391 | if (rc != 0) { | |
392 | cERROR(1, ("Unable to open file to get ACL")); | |
393 | FreeXid(xid); | |
394 | return; | |
395 | } | |
396 | } | |
397 | ||
398 | rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, &acllen); | |
399 | cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, acllen)); | |
400 | if (unlock_file == TRUE) | |
401 | atomic_dec(&open_file->wrtPending); | |
402 | else | |
403 | CIFSSMBClose(xid, cifs_sb->tcon, fid); | |
404 | ||
405 | /* parse ACEs */ | |
406 | if (!rc) | |
407 | rc = parse_sec_desc(pntsd, acllen, inode); | |
408 | kfree(pntsd); | |
409 | FreeXid(xid); | |
410 | return; | |
411 | } | |
297647c2 | 412 | #endif /* CONFIG_CIFS_EXPERIMENTAL */ |