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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"}, | |
41 | {{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(546), 0, 0, 0} }, "guest"} | |
297647c2 SF |
42 | }; |
43 | ||
44 | ||
bcb02034 SF |
45 | /* security id for everyone */ |
46 | static const struct cifs_sid sid_everyone = | |
d12fd121 | 47 | {1, 1, {0, 0, 0, 0, 0, 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 */ | |
297647c2 SF |
100 | int compare_sids(struct cifs_sid *ctsid, struct cifs_sid *cwsid) |
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 | ||
4879b448 SF |
132 | void get_mode_from_acl(struct inode * inode, const char * path) |
133 | { | |
134 | ||
135 | if (inode == NULL) | |
136 | return; | |
137 | ||
138 | /* find an open readable handle | |
139 | if handle found | |
140 | lock handle | |
141 | else open file | |
142 | if no open file can not hurt to check if path is null | |
143 | GetCIFSACL | |
144 | for all ACEs in ACL { | |
145 | if U or G or O | |
146 | inode->i_mode = parse_ace(file_type, UG or O, ace->perms, inode->i_mode) | |
147 | else continue | |
148 | } | |
149 | if handle open close it | |
150 | else unlock handle */ | |
151 | ||
152 | return; | |
153 | } | |
154 | ||
297647c2 | 155 | |
d12fd121 | 156 | static void parse_ace(struct cifs_ace *pace, char *end_of_acl) |
d0d66c44 | 157 | { |
d0d66c44 | 158 | int num_subauth; |
d0d66c44 SP |
159 | |
160 | /* validate that we do not go past end of acl */ | |
297647c2 SF |
161 | |
162 | /* XXX this if statement can be removed | |
d0d66c44 SP |
163 | if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) { |
164 | cERROR(1, ("ACL too small to parse ACE")); | |
165 | return; | |
297647c2 | 166 | } */ |
d0d66c44 | 167 | |
ce51ae14 | 168 | num_subauth = pace->num_subauth; |
d0d66c44 | 169 | if (num_subauth) { |
d12fd121 | 170 | #ifdef CONFIG_CIFS_DEBUG2 |
8f18c131 | 171 | int i; |
d12fd121 SF |
172 | cFYI(1, ("ACE revision %d num_subauth %d", |
173 | pace->revision, pace->num_subauth)); | |
174 | for (i = 0; i < num_subauth; ++i) { | |
175 | cFYI(1, ("ACE sub_auth[%d]: 0x%x", i, | |
297647c2 | 176 | le32_to_cpu(pace->sub_auth[i]))); |
d12fd121 SF |
177 | } |
178 | ||
179 | /* BB add length check to make sure that we do not have huge | |
180 | num auths and therefore go off the end */ | |
181 | ||
297647c2 | 182 | cFYI(1, ("RID %d", le32_to_cpu(pace->sub_auth[num_subauth-1]))); |
d12fd121 SF |
183 | #endif |
184 | } | |
185 | ||
186 | return; | |
187 | } | |
188 | ||
189 | static void parse_ntace(struct cifs_ntace *pntace, char *end_of_acl) | |
190 | { | |
191 | /* validate that we do not go past end of acl */ | |
d0d66c44 SP |
192 | if (end_of_acl < (char *)pntace + sizeof(struct cifs_ntace)) { |
193 | cERROR(1, ("ACL too small to parse NT ACE")); | |
194 | return; | |
195 | } | |
196 | ||
197 | #ifdef CONFIG_CIFS_DEBUG2 | |
198 | cFYI(1, ("NTACE type %d flags 0x%x size %d, access Req 0x%x", | |
199 | pntace->type, pntace->flags, pntace->size, | |
200 | pntace->access_req)); | |
201 | #endif | |
202 | return; | |
203 | } | |
204 | ||
205 | ||
206 | ||
a750e77c | 207 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
d628ddb6 | 208 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid) |
d0d66c44 SP |
209 | { |
210 | int i; | |
211 | int num_aces = 0; | |
212 | int acl_size; | |
213 | char *acl_base; | |
214 | struct cifs_ntace **ppntace; | |
215 | struct cifs_ace **ppace; | |
216 | ||
217 | /* BB need to add parm so we can store the SID BB */ | |
218 | ||
219 | /* validate that we do not go past end of acl */ | |
af6f4612 | 220 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
d0d66c44 SP |
221 | cERROR(1, ("ACL too small to parse DACL")); |
222 | return; | |
223 | } | |
224 | ||
225 | #ifdef CONFIG_CIFS_DEBUG2 | |
226 | cFYI(1, ("DACL revision %d size %d num aces %d", | |
af6f4612 SF |
227 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
228 | le32_to_cpu(pdacl->num_aces))); | |
d0d66c44 SP |
229 | #endif |
230 | ||
231 | acl_base = (char *)pdacl; | |
232 | acl_size = sizeof(struct cifs_acl); | |
233 | ||
adbc0358 | 234 | num_aces = le32_to_cpu(pdacl->num_aces); |
d0d66c44 SP |
235 | if (num_aces > 0) { |
236 | ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *), | |
237 | GFP_KERNEL); | |
238 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), | |
239 | GFP_KERNEL); | |
240 | ||
d12fd121 SF |
241 | /* cifscred->cecount = pdacl->num_aces; |
242 | cifscred->ntaces = kmalloc(num_aces * | |
243 | sizeof(struct cifs_ntace *), GFP_KERNEL); | |
244 | cifscred->aces = kmalloc(num_aces * | |
245 | sizeof(struct cifs_ace *), GFP_KERNEL);*/ | |
d0d66c44 | 246 | |
d0d66c44 SP |
247 | for (i = 0; i < num_aces; ++i) { |
248 | ppntace[i] = (struct cifs_ntace *) | |
249 | (acl_base + acl_size); | |
250 | ppace[i] = (struct cifs_ace *) ((char *)ppntace[i] + | |
251 | sizeof(struct cifs_ntace)); | |
252 | ||
253 | parse_ntace(ppntace[i], end_of_acl); | |
297647c2 | 254 | if (end_of_acl < ((char *)ppace[i] + |
ce51ae14 | 255 | (le16_to_cpu(ppntace[i]->size) - |
297647c2 SF |
256 | sizeof(struct cifs_ntace)))) { |
257 | cERROR(1, ("ACL too small to parse ACE")); | |
258 | break; | |
259 | } else | |
260 | parse_ace(ppace[i], end_of_acl); | |
d0d66c44 | 261 | |
d12fd121 SF |
262 | /* memcpy((void *)(&(cifscred->ntaces[i])), |
263 | (void *)ppntace[i], | |
264 | sizeof(struct cifs_ntace)); | |
265 | memcpy((void *)(&(cifscred->aces[i])), | |
266 | (void *)ppace[i], | |
267 | sizeof(struct cifs_ace)); */ | |
d0d66c44 SP |
268 | |
269 | acl_base = (char *)ppntace[i]; | |
ce51ae14 | 270 | acl_size = le16_to_cpu(ppntace[i]->size); |
d0d66c44 SP |
271 | } |
272 | ||
273 | kfree(ppace); | |
274 | kfree(ppntace); | |
275 | } | |
276 | ||
277 | return; | |
278 | } | |
279 | ||
bcb02034 SF |
280 | |
281 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) | |
282 | { | |
d0d66c44 | 283 | |
bcb02034 SF |
284 | /* BB need to add parm so we can store the SID BB */ |
285 | ||
286 | /* validate that we do not go past end of acl */ | |
287 | if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) { | |
d0d66c44 | 288 | cERROR(1, ("ACL too small to parse SID")); |
bcb02034 SF |
289 | return -EINVAL; |
290 | } | |
d0d66c44 | 291 | |
af6f4612 | 292 | if (psid->num_subauth) { |
bcb02034 | 293 | #ifdef CONFIG_CIFS_DEBUG2 |
8f18c131 | 294 | int i; |
d0d66c44 SP |
295 | cFYI(1, ("SID revision %d num_auth %d First subauth 0x%x", |
296 | psid->revision, psid->num_subauth, psid->sub_auth[0])); | |
bcb02034 | 297 | |
af6f4612 | 298 | for (i = 0; i < psid->num_subauth; i++) { |
d0d66c44 | 299 | cFYI(1, ("SID sub_auth[%d]: 0x%x ", i, |
297647c2 | 300 | le32_to_cpu(psid->sub_auth[i]))); |
d0d66c44 SP |
301 | } |
302 | ||
d12fd121 | 303 | /* BB add length check to make sure that we do not have huge |
d0d66c44 | 304 | num auths and therefore go off the end */ |
d12fd121 | 305 | cFYI(1, ("RID 0x%x", |
af6f4612 | 306 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1]))); |
bcb02034 | 307 | #endif |
d0d66c44 SP |
308 | } |
309 | ||
bcb02034 SF |
310 | return 0; |
311 | } | |
312 | ||
d0d66c44 | 313 | |
bcb02034 SF |
314 | /* Convert CIFS ACL to POSIX form */ |
315 | int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len) | |
316 | { | |
d0d66c44 | 317 | int rc; |
bcb02034 SF |
318 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
319 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ | |
bcb02034 SF |
320 | char *end_of_acl = ((char *)pntsd) + acl_len; |
321 | ||
322 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + | |
af6f4612 | 323 | le32_to_cpu(pntsd->osidoffset)); |
bcb02034 | 324 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
af6f4612 | 325 | le32_to_cpu(pntsd->gsidoffset)); |
bcb02034 | 326 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + |
af6f4612 | 327 | le32_to_cpu(pntsd->dacloffset)); |
bcb02034 SF |
328 | #ifdef CONFIG_CIFS_DEBUG2 |
329 | cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x " | |
330 | "sacloffset 0x%x dacloffset 0x%x", | |
af6f4612 SF |
331 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
332 | le32_to_cpu(pntsd->gsidoffset), | |
333 | le32_to_cpu(pntsd->sacloffset), | |
ce51ae14 | 334 | le32_to_cpu(pntsd->dacloffset))); |
bcb02034 SF |
335 | #endif |
336 | rc = parse_sid(owner_sid_ptr, end_of_acl); | |
337 | if (rc) | |
338 | return rc; | |
339 | ||
340 | rc = parse_sid(group_sid_ptr, end_of_acl); | |
341 | if (rc) | |
342 | return rc; | |
343 | ||
a750e77c | 344 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, group_sid_ptr); |
d0d66c44 | 345 | |
bcb02034 SF |
346 | /* cifscred->uid = owner_sid_ptr->rid; |
347 | cifscred->gid = group_sid_ptr->rid; | |
348 | memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr, | |
349 | sizeof (struct cifs_sid)); | |
350 | memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr, | |
351 | sizeof (struct cifs_sid)); */ | |
352 | ||
297647c2 | 353 | |
bcb02034 SF |
354 | return (0); |
355 | } | |
297647c2 | 356 | #endif /* CONFIG_CIFS_EXPERIMENTAL */ |