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 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}, {11, 0, 0, 0, 0} }, "net-users"},
38 {{1, 1, {0, 0, 0, 0, 0, 5}, {18, 0, 0, 0, 0} }, "sys"},
39 {{1, 2, {0, 0, 0, 0, 0, 5}, {32, 544, 0, 0, 0} }, "root"},
40 {{1, 2, {0, 0, 0, 0, 0, 5}, {32, 545, 0, 0, 0} }, "users"},
41 {{1, 2, {0, 0, 0, 0, 0, 5}, {32, 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 = cpu_to_le32(ctsid->num_subauth);
79 num_saw = cpu_to_le32(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"));
99 int compare_sids(struct cifs_sid *ctsid, struct cifs_sid *cwsid)
102 int num_subauth, num_sat, num_saw;
104 if ((!ctsid) || (!cwsid))
107 /* compare the revision */
108 if (ctsid->revision != cwsid->revision)
111 /* compare all of the six auth values */
112 for (i = 0; i < 6; ++i) {
113 if (ctsid->authority[i] != cwsid->authority[i])
117 /* compare all of the subauth values if any */
118 num_sat = cpu_to_le32(ctsid->num_subauth);
119 num_saw = cpu_to_le32(cwsid->num_subauth);
120 num_subauth = num_sat < num_saw ? num_sat : num_saw;
122 for (i = 0; i < num_subauth; ++i) {
123 if (ctsid->sub_auth[i] != cwsid->sub_auth[i])
128 return (0); /* sids compare/match */
132 static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
137 /* validate that we do not go past end of acl */
139 /* XXX this if statement can be removed
140 if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
141 cERROR(1, ("ACL too small to parse ACE"));
145 num_subauth = cpu_to_le32(pace->num_subauth);
147 #ifdef CONFIG_CIFS_DEBUG2
148 cFYI(1, ("ACE revision %d num_subauth %d",
149 pace->revision, pace->num_subauth));
150 for (i = 0; i < num_subauth; ++i) {
151 cFYI(1, ("ACE sub_auth[%d]: 0x%x", i,
152 le32_to_cpu(pace->sub_auth[i])));
155 /* BB add length check to make sure that we do not have huge
156 num auths and therefore go off the end */
158 cFYI(1, ("RID %d", le32_to_cpu(pace->sub_auth[num_subauth-1])));
165 static void parse_ntace(struct cifs_ntace *pntace, char *end_of_acl)
167 /* validate that we do not go past end of acl */
168 if (end_of_acl < (char *)pntace + sizeof(struct cifs_ntace)) {
169 cERROR(1, ("ACL too small to parse NT ACE"));
173 #ifdef CONFIG_CIFS_DEBUG2
174 cFYI(1, ("NTACE type %d flags 0x%x size %d, access Req 0x%x",
175 pntace->type, pntace->flags, pntace->size,
176 pntace->access_req));
183 static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl)
189 struct cifs_ntace **ppntace;
190 struct cifs_ace **ppace;
192 /* BB need to add parm so we can store the SID BB */
194 /* validate that we do not go past end of acl */
195 if (end_of_acl < (char *)pdacl + pdacl->size) {
196 cERROR(1, ("ACL too small to parse DACL"));
200 #ifdef CONFIG_CIFS_DEBUG2
201 cFYI(1, ("DACL revision %d size %d num aces %d",
202 pdacl->revision, pdacl->size, pdacl->num_aces));
205 acl_base = (char *)pdacl;
206 acl_size = sizeof(struct cifs_acl);
208 num_aces = cpu_to_le32(pdacl->num_aces);
210 ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
212 ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
215 /* cifscred->cecount = pdacl->num_aces;
216 cifscred->ntaces = kmalloc(num_aces *
217 sizeof(struct cifs_ntace *), GFP_KERNEL);
218 cifscred->aces = kmalloc(num_aces *
219 sizeof(struct cifs_ace *), GFP_KERNEL);*/
222 for (i = 0; i < num_aces; ++i) {
223 ppntace[i] = (struct cifs_ntace *)
224 (acl_base + acl_size);
225 ppace[i] = (struct cifs_ace *) ((char *)ppntace[i] +
226 sizeof(struct cifs_ntace));
228 parse_ntace(ppntace[i], end_of_acl);
229 if (end_of_acl < ((char *)ppace[i] +
231 sizeof(struct cifs_ntace)))) {
232 cERROR(1, ("ACL too small to parse ACE"));
235 parse_ace(ppace[i], end_of_acl);
237 /* memcpy((void *)(&(cifscred->ntaces[i])),
239 sizeof(struct cifs_ntace));
240 memcpy((void *)(&(cifscred->aces[i])),
242 sizeof(struct cifs_ace)); */
244 acl_base = (char *)ppntace[i];
245 acl_size = cpu_to_le32(ppntace[i]->size);
256 static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
261 /* BB need to add parm so we can store the SID BB */
263 /* validate that we do not go past end of acl */
264 if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
265 cERROR(1, ("ACL too small to parse SID"));
269 num_subauth = cpu_to_le32(psid->num_subauth);
271 #ifdef CONFIG_CIFS_DEBUG2
272 cFYI(1, ("SID revision %d num_auth %d First subauth 0x%x",
273 psid->revision, psid->num_subauth, psid->sub_auth[0]));
275 for (i = 0; i < num_subauth; ++i) {
276 cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
277 le32_to_cpu(psid->sub_auth[i])));
280 /* BB add length check to make sure that we do not have huge
281 num auths and therefore go off the end */
283 le32_to_cpu(psid->sub_auth[num_subauth-1])));
291 /* Convert CIFS ACL to POSIX form */
292 int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
295 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
296 struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
297 char *end_of_acl = ((char *)pntsd) + acl_len;
299 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
300 cpu_to_le32(pntsd->osidoffset));
301 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
302 cpu_to_le32(pntsd->gsidoffset));
303 dacl_ptr = (struct cifs_acl *)((char *)pntsd +
304 cpu_to_le32(pntsd->dacloffset));
305 #ifdef CONFIG_CIFS_DEBUG2
306 cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
307 "sacloffset 0x%x dacloffset 0x%x",
308 pntsd->revision, pntsd->type,
309 pntsd->osidoffset, pntsd->gsidoffset, pntsd->sacloffset,
312 rc = parse_sid(owner_sid_ptr, end_of_acl);
316 rc = parse_sid(group_sid_ptr, end_of_acl);
320 parse_dacl(dacl_ptr, end_of_acl);
322 /* cifscred->uid = owner_sid_ptr->rid;
323 cifscred->gid = group_sid_ptr->rid;
324 memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr,
325 sizeof (struct cifs_sid));
326 memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
327 sizeof (struct cifs_sid)); */
332 #endif /* CONFIG_CIFS_EXPERIMENTAL */