4 * Copyright (C) International Business Machines Corp., 2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Contains the routines for mapping CIFS/NTFS ACLs
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.
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.
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
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
32 #ifdef CONFIG_CIFS_EXPERIMENTAL
34 static struct cifs_wksid wksidarr[NUM_WK_SIDS] = {
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"},
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"}
45 /* security id for everyone */
46 static const struct cifs_sid sid_everyone =
47 {1, 1, {0, 0, 0, 0, 0, 0}, {} };
49 static const struct cifs_sid sid_user =
50 {1, 2 , {0, 0, 0, 0, 0, 5}, {} };
53 int match_sid(struct cifs_sid *ctsid)
56 int num_subauth, num_sat, num_saw;
57 struct cifs_sid *cwsid;
62 for (i = 0; i < NUM_WK_SIDS; ++i) {
63 cwsid = &(wksidarr[i].cifssid);
65 /* compare the revision */
66 if (ctsid->revision != cwsid->revision)
69 /* compare all of the six auth values */
70 for (j = 0; j < 6; ++j) {
71 if (ctsid->authority[j] != cwsid->authority[j])
75 continue; /* all of the auth values did not match */
77 /* compare all of the subauth values if any */
78 num_sat = ctsid->num_subauth;
79 num_saw = cwsid->num_subauth;
80 num_subauth = num_sat < num_saw ? num_sat : num_saw;
82 for (j = 0; j < num_subauth; ++j) {
83 if (ctsid->sub_auth[j] != cwsid->sub_auth[j])
87 continue; /* all sub_auth values do not match */
90 cFYI(1, ("matching sid: %s\n", wksidarr[i].sidname));
91 return (0); /* sids compare/match */
94 cFYI(1, ("No matching sid"));
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 */
100 int compare_sids(struct cifs_sid *ctsid, struct cifs_sid *cwsid)
103 int num_subauth, num_sat, num_saw;
105 if ((!ctsid) || (!cwsid))
108 /* compare the revision */
109 if (ctsid->revision != cwsid->revision)
112 /* compare all of the six auth values */
113 for (i = 0; i < 6; ++i) {
114 if (ctsid->authority[i] != cwsid->authority[i])
118 /* compare all of the subauth values if any */
119 num_sat = ctsid->num_subauth;
120 num_saw = cwsid->num_subauth;
121 num_subauth = num_sat < num_saw ? num_sat : num_saw;
123 for (i = 0; i < num_subauth; ++i) {
124 if (ctsid->sub_auth[i] != cwsid->sub_auth[i])
129 return (1); /* sids compare/match */
132 void get_mode_from_acl(struct inode * inode, const char * path)
138 /* find an open readable handle
142 if no open file can not hurt to check if path is null
144 for all ACEs in ACL {
146 inode->i_mode = parse_ace(file_type, UG or O, ace->perms, inode->i_mode)
149 if handle open close it
150 else unlock handle */
156 static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
160 /* validate that we do not go past end of acl */
162 /* XXX this if statement can be removed
163 if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
164 cERROR(1, ("ACL too small to parse ACE"));
168 num_subauth = pace->num_subauth;
170 #ifdef CONFIG_CIFS_DEBUG2
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,
176 le32_to_cpu(pace->sub_auth[i])));
179 /* BB add length check to make sure that we do not have huge
180 num auths and therefore go off the end */
182 cFYI(1, ("RID %d", le32_to_cpu(pace->sub_auth[num_subauth-1])));
189 static void parse_ntace(struct cifs_ntace *pntace, char *end_of_acl)
191 /* validate that we do not go past end of acl */
192 if (end_of_acl < (char *)pntace + sizeof(struct cifs_ntace)) {
193 cERROR(1, ("ACL too small to parse NT ACE"));
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));
207 static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
208 struct cifs_sid *pownersid, struct cifs_sid *pgrpsid)
214 struct cifs_ntace **ppntace;
215 struct cifs_ace **ppace;
217 /* BB need to add parm so we can store the SID BB */
219 /* validate that we do not go past end of acl */
220 if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
221 cERROR(1, ("ACL too small to parse DACL"));
225 #ifdef CONFIG_CIFS_DEBUG2
226 cFYI(1, ("DACL revision %d size %d num aces %d",
227 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
228 le32_to_cpu(pdacl->num_aces)));
231 acl_base = (char *)pdacl;
232 acl_size = sizeof(struct cifs_acl);
234 num_aces = le32_to_cpu(pdacl->num_aces);
236 ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
238 ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
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);*/
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));
253 parse_ntace(ppntace[i], end_of_acl);
254 if (end_of_acl < ((char *)ppace[i] +
255 (le16_to_cpu(ppntace[i]->size) -
256 sizeof(struct cifs_ntace)))) {
257 cERROR(1, ("ACL too small to parse ACE"));
260 parse_ace(ppace[i], end_of_acl);
262 /* memcpy((void *)(&(cifscred->ntaces[i])),
264 sizeof(struct cifs_ntace));
265 memcpy((void *)(&(cifscred->aces[i])),
267 sizeof(struct cifs_ace)); */
269 acl_base = (char *)ppntace[i];
270 acl_size = le16_to_cpu(ppntace[i]->size);
281 static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
284 /* BB need to add parm so we can store the SID BB */
286 /* validate that we do not go past end of acl */
287 if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
288 cERROR(1, ("ACL too small to parse SID"));
292 if (psid->num_subauth) {
293 #ifdef CONFIG_CIFS_DEBUG2
295 cFYI(1, ("SID revision %d num_auth %d First subauth 0x%x",
296 psid->revision, psid->num_subauth, psid->sub_auth[0]));
298 for (i = 0; i < psid->num_subauth; i++) {
299 cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
300 le32_to_cpu(psid->sub_auth[i])));
303 /* BB add length check to make sure that we do not have huge
304 num auths and therefore go off the end */
306 le32_to_cpu(psid->sub_auth[psid->num_subauth-1])));
314 /* Convert CIFS ACL to POSIX form */
315 int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
318 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
319 struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
320 char *end_of_acl = ((char *)pntsd) + acl_len;
322 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
323 le32_to_cpu(pntsd->osidoffset));
324 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
325 le32_to_cpu(pntsd->gsidoffset));
326 dacl_ptr = (struct cifs_acl *)((char *)pntsd +
327 le32_to_cpu(pntsd->dacloffset));
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",
331 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
332 le32_to_cpu(pntsd->gsidoffset),
333 le32_to_cpu(pntsd->sacloffset),
334 le32_to_cpu(pntsd->dacloffset)));
336 rc = parse_sid(owner_sid_ptr, end_of_acl);
340 rc = parse_sid(group_sid_ptr, end_of_acl);
344 parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, group_sid_ptr);
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)); */
356 #endif /* CONFIG_CIFS_EXPERIMENTAL */