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)
135 cFYI(1, ("get mode from ACL for %s", path));
140 /* find an open readable handle
144 if no open file can not hurt to check if path is null
146 for all ACEs in ACL {
148 inode->i_mode = parse_ace(file_type, UG or O, ace->perms, inode->i_mode)
151 if handle open close it
152 else unlock handle */
158 static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
162 /* validate that we do not go past end of acl */
164 if (le16_to_cpu(pace->size) < 16) {
165 cERROR(1, ("ACE too small, %d", le16_to_cpu(pace->size)));
169 if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) {
170 cERROR(1, ("ACL too small to parse ACE"));
174 num_subauth = pace->sid.num_subauth;
176 #ifdef CONFIG_CIFS_DEBUG2
178 cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d",
179 pace->sid.revision, pace->sid.num_subauth, pace->type,
180 pace->flags, pace->size));
181 for (i = 0; i < num_subauth; ++i) {
182 cFYI(1, ("ACE sub_auth[%d]: 0x%x", i,
183 le32_to_cpu(pace->sid.sub_auth[i])));
186 /* BB add length check to make sure that we do not have huge
187 num auths and therefore go off the end */
195 static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
196 struct cifs_sid *pownersid, struct cifs_sid *pgrpsid)
202 struct cifs_ace **ppace;
204 /* BB need to add parm so we can store the SID BB */
206 /* validate that we do not go past end of acl */
207 if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
208 cERROR(1, ("ACL too small to parse DACL"));
212 #ifdef CONFIG_CIFS_DEBUG2
213 cFYI(1, ("DACL revision %d size %d num aces %d",
214 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
215 le32_to_cpu(pdacl->num_aces)));
218 acl_base = (char *)pdacl;
219 acl_size = sizeof(struct cifs_acl);
221 num_aces = le32_to_cpu(pdacl->num_aces);
223 ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
226 /* cifscred->cecount = pdacl->num_aces;
227 cifscred->aces = kmalloc(num_aces *
228 sizeof(struct cifs_ace *), GFP_KERNEL);*/
230 for (i = 0; i < num_aces; ++i) {
231 ppace[i] = (struct cifs_ace *) (acl_base + acl_size);
233 parse_ace(ppace[i], end_of_acl);
235 /* memcpy((void *)(&(cifscred->aces[i])),
237 sizeof(struct cifs_ace)); */
239 acl_base = (char *)ppace[i];
240 acl_size = le16_to_cpu(ppace[i]->size);
250 static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
253 /* BB need to add parm so we can store the SID BB */
255 /* validate that we do not go past end of acl */
256 if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
257 cERROR(1, ("ACL too small to parse SID"));
261 if (psid->num_subauth) {
262 #ifdef CONFIG_CIFS_DEBUG2
264 cFYI(1, ("SID revision %d num_auth %d",
265 psid->revision, psid->num_subauth));
267 for (i = 0; i < psid->num_subauth; i++) {
268 cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
269 le32_to_cpu(psid->sub_auth[i])));
272 /* BB add length check to make sure that we do not have huge
273 num auths and therefore go off the end */
275 le32_to_cpu(psid->sub_auth[psid->num_subauth-1])));
283 /* Convert CIFS ACL to POSIX form */
284 int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
287 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
288 struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
289 char *end_of_acl = ((char *)pntsd) + acl_len;
291 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
292 le32_to_cpu(pntsd->osidoffset));
293 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
294 le32_to_cpu(pntsd->gsidoffset));
295 dacl_ptr = (struct cifs_acl *)((char *)pntsd +
296 le32_to_cpu(pntsd->dacloffset));
297 #ifdef CONFIG_CIFS_DEBUG2
298 cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
299 "sacloffset 0x%x dacloffset 0x%x",
300 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
301 le32_to_cpu(pntsd->gsidoffset),
302 le32_to_cpu(pntsd->sacloffset),
303 le32_to_cpu(pntsd->dacloffset)));
305 rc = parse_sid(owner_sid_ptr, end_of_acl);
309 rc = parse_sid(group_sid_ptr, end_of_acl);
313 parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, group_sid_ptr);
315 /* cifscred->uid = owner_sid_ptr->rid;
316 cifscred->gid = group_sid_ptr->rid;
317 memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr,
318 sizeof (struct cifs_sid));
319 memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
320 sizeof (struct cifs_sid)); */
325 #endif /* CONFIG_CIFS_EXPERIMENTAL */