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Steve Frenchbcb02032007-09-25 16:17:24 +00001/*
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
Steve French65874002007-09-25 19:53:44 +000024#include <linux/fs.h>
25#include "cifspdu.h"
26#include "cifsglob.h"
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +000027#include "cifsacl.h"
Steve French65874002007-09-25 19:53:44 +000028#include "cifsproto.h"
29#include "cifs_debug.h"
Steve French65874002007-09-25 19:53:44 +000030
Steve French297647c2007-10-12 04:11:59 +000031
32#ifdef CONFIG_CIFS_EXPERIMENTAL
33
Steve Frenchaf6f4612007-10-16 18:40:37 +000034static struct cifs_wksid wksidarr[NUM_WK_SIDS] = {
Steve French297647c2007-10-12 04:11:59 +000035 {{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"},
Dave Kleikampce51ae12007-10-16 21:35:39 +000037 {{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"}
Steve French297647c2007-10-12 04:11:59 +000042};
43
44
Steve Frenchbcb02032007-09-25 16:17:24 +000045/* security id for everyone */
46static const struct cifs_sid sid_everyone =
Steve Frenchd12fd122007-10-03 19:43:19 +000047 {1, 1, {0, 0, 0, 0, 0, 0}, {} };
Steve Frenchbcb02032007-09-25 16:17:24 +000048/* group users */
49static const struct cifs_sid sid_user =
Steve Frenchd12fd122007-10-03 19:43:19 +000050 {1, 2 , {0, 0, 0, 0, 0, 5}, {} };
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +000051
Steve French297647c2007-10-12 04:11:59 +000052
53int 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 */
Dave Kleikampce51ae12007-10-16 21:35:39 +000078 num_sat = ctsid->num_subauth;
79 num_saw = cwsid->num_subauth;
Steve French297647c2007-10-12 04:11:59 +000080 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
98
99int compare_sids(struct cifs_sid *ctsid, struct cifs_sid *cwsid)
100{
101 int i;
102 int num_subauth, num_sat, num_saw;
103
104 if ((!ctsid) || (!cwsid))
105 return (-1);
106
107 /* compare the revision */
108 if (ctsid->revision != cwsid->revision)
109 return (-1);
110
111 /* compare all of the six auth values */
112 for (i = 0; i < 6; ++i) {
113 if (ctsid->authority[i] != cwsid->authority[i])
114 return (-1);
115 }
116
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;
121 if (num_subauth) {
122 for (i = 0; i < num_subauth; ++i) {
123 if (ctsid->sub_auth[i] != cwsid->sub_auth[i])
124 return (-1);
125 }
126 }
127
128 return (0); /* sids compare/match */
129}
130
131
Steve Frenchd12fd122007-10-03 19:43:19 +0000132static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000133{
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000134 int num_subauth;
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000135
136 /* validate that we do not go past end of acl */
Steve French297647c2007-10-12 04:11:59 +0000137
138 /* XXX this if statement can be removed
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000139 if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
140 cERROR(1, ("ACL too small to parse ACE"));
141 return;
Steve French297647c2007-10-12 04:11:59 +0000142 } */
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000143
Dave Kleikampce51ae12007-10-16 21:35:39 +0000144 num_subauth = pace->num_subauth;
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000145 if (num_subauth) {
Steve Frenchd12fd122007-10-03 19:43:19 +0000146#ifdef CONFIG_CIFS_DEBUG2
Steve French8f18c132007-10-12 18:54:12 +0000147 int i;
Steve Frenchd12fd122007-10-03 19:43:19 +0000148 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,
Steve French297647c2007-10-12 04:11:59 +0000152 le32_to_cpu(pace->sub_auth[i])));
Steve Frenchd12fd122007-10-03 19:43:19 +0000153 }
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000154
Steve Frenchd12fd122007-10-03 19:43:19 +0000155 /* BB add length check to make sure that we do not have huge
156 num auths and therefore go off the end */
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000157
Steve French297647c2007-10-12 04:11:59 +0000158 cFYI(1, ("RID %d", le32_to_cpu(pace->sub_auth[num_subauth-1])));
Steve Frenchd12fd122007-10-03 19:43:19 +0000159#endif
160 }
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000161
Steve Frenchd12fd122007-10-03 19:43:19 +0000162 return;
163}
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000164
Steve Frenchd12fd122007-10-03 19:43:19 +0000165static void parse_ntace(struct cifs_ntace *pntace, char *end_of_acl)
166{
167 /* validate that we do not go past end of acl */
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000168 if (end_of_acl < (char *)pntace + sizeof(struct cifs_ntace)) {
169 cERROR(1, ("ACL too small to parse NT ACE"));
170 return;
171 }
172
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));
177#endif
178 return;
179}
180
181
182
Steve Frenchd12fd122007-10-03 19:43:19 +0000183static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl)
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000184{
185 int i;
186 int num_aces = 0;
187 int acl_size;
188 char *acl_base;
189 struct cifs_ntace **ppntace;
190 struct cifs_ace **ppace;
191
192 /* BB need to add parm so we can store the SID BB */
193
194 /* validate that we do not go past end of acl */
Steve Frenchaf6f4612007-10-16 18:40:37 +0000195 if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000196 cERROR(1, ("ACL too small to parse DACL"));
197 return;
198 }
199
200#ifdef CONFIG_CIFS_DEBUG2
201 cFYI(1, ("DACL revision %d size %d num aces %d",
Steve Frenchaf6f4612007-10-16 18:40:37 +0000202 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
203 le32_to_cpu(pdacl->num_aces)));
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000204#endif
205
206 acl_base = (char *)pdacl;
207 acl_size = sizeof(struct cifs_acl);
208
209 num_aces = cpu_to_le32(pdacl->num_aces);
210 if (num_aces > 0) {
211 ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
212 GFP_KERNEL);
213 ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
214 GFP_KERNEL);
215
Steve Frenchd12fd122007-10-03 19:43:19 +0000216/* cifscred->cecount = pdacl->num_aces;
217 cifscred->ntaces = kmalloc(num_aces *
218 sizeof(struct cifs_ntace *), GFP_KERNEL);
219 cifscred->aces = kmalloc(num_aces *
220 sizeof(struct cifs_ace *), GFP_KERNEL);*/
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000221
222
223 for (i = 0; i < num_aces; ++i) {
224 ppntace[i] = (struct cifs_ntace *)
225 (acl_base + acl_size);
226 ppace[i] = (struct cifs_ace *) ((char *)ppntace[i] +
227 sizeof(struct cifs_ntace));
228
229 parse_ntace(ppntace[i], end_of_acl);
Steve French297647c2007-10-12 04:11:59 +0000230 if (end_of_acl < ((char *)ppace[i] +
Dave Kleikampce51ae12007-10-16 21:35:39 +0000231 (le16_to_cpu(ppntace[i]->size) -
Steve French297647c2007-10-12 04:11:59 +0000232 sizeof(struct cifs_ntace)))) {
233 cERROR(1, ("ACL too small to parse ACE"));
234 break;
235 } else
236 parse_ace(ppace[i], end_of_acl);
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000237
Steve Frenchd12fd122007-10-03 19:43:19 +0000238/* memcpy((void *)(&(cifscred->ntaces[i])),
239 (void *)ppntace[i],
240 sizeof(struct cifs_ntace));
241 memcpy((void *)(&(cifscred->aces[i])),
242 (void *)ppace[i],
243 sizeof(struct cifs_ace)); */
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000244
245 acl_base = (char *)ppntace[i];
Dave Kleikampce51ae12007-10-16 21:35:39 +0000246 acl_size = le16_to_cpu(ppntace[i]->size);
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000247 }
248
249 kfree(ppace);
250 kfree(ppntace);
251 }
252
253 return;
254}
255
Steve Frenchbcb02032007-09-25 16:17:24 +0000256
257static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
258{
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000259
Steve Frenchbcb02032007-09-25 16:17:24 +0000260 /* BB need to add parm so we can store the SID BB */
261
262 /* validate that we do not go past end of acl */
263 if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000264 cERROR(1, ("ACL too small to parse SID"));
Steve Frenchbcb02032007-09-25 16:17:24 +0000265 return -EINVAL;
266 }
Steve Frenchbcb02032007-09-25 16:17:24 +0000267
Steve Frenchaf6f4612007-10-16 18:40:37 +0000268 if (psid->num_subauth) {
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000269#ifdef CONFIG_CIFS_DEBUG2
Steve French8f18c132007-10-12 18:54:12 +0000270 int i;
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000271 cFYI(1, ("SID revision %d num_auth %d First subauth 0x%x",
272 psid->revision, psid->num_subauth, psid->sub_auth[0]));
273
Steve Frenchaf6f4612007-10-16 18:40:37 +0000274 for (i = 0; i < psid->num_subauth; i++) {
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000275 cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
Steve French297647c2007-10-12 04:11:59 +0000276 le32_to_cpu(psid->sub_auth[i])));
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000277 }
278
Steve Frenchd12fd122007-10-03 19:43:19 +0000279 /* BB add length check to make sure that we do not have huge
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000280 num auths and therefore go off the end */
Steve Frenchd12fd122007-10-03 19:43:19 +0000281 cFYI(1, ("RID 0x%x",
Steve Frenchaf6f4612007-10-16 18:40:37 +0000282 le32_to_cpu(psid->sub_auth[psid->num_subauth-1])));
Steve Frenchbcb02032007-09-25 16:17:24 +0000283#endif
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000284 }
285
Steve Frenchbcb02032007-09-25 16:17:24 +0000286 return 0;
287}
288
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000289
Steve Frenchbcb02032007-09-25 16:17:24 +0000290/* Convert CIFS ACL to POSIX form */
291int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
292{
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000293 int rc;
Steve Frenchbcb02032007-09-25 16:17:24 +0000294 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
295 struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
Steve Frenchbcb02032007-09-25 16:17:24 +0000296 char *end_of_acl = ((char *)pntsd) + acl_len;
297
298 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
Steve Frenchaf6f4612007-10-16 18:40:37 +0000299 le32_to_cpu(pntsd->osidoffset));
Steve Frenchbcb02032007-09-25 16:17:24 +0000300 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
Steve Frenchaf6f4612007-10-16 18:40:37 +0000301 le32_to_cpu(pntsd->gsidoffset));
Steve Frenchbcb02032007-09-25 16:17:24 +0000302 dacl_ptr = (struct cifs_acl *)((char *)pntsd +
Steve Frenchaf6f4612007-10-16 18:40:37 +0000303 le32_to_cpu(pntsd->dacloffset));
Steve Frenchbcb02032007-09-25 16:17:24 +0000304#ifdef CONFIG_CIFS_DEBUG2
305 cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
306 "sacloffset 0x%x dacloffset 0x%x",
Steve Frenchaf6f4612007-10-16 18:40:37 +0000307 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
308 le32_to_cpu(pntsd->gsidoffset),
309 le32_to_cpu(pntsd->sacloffset),
Dave Kleikampce51ae12007-10-16 21:35:39 +0000310 le32_to_cpu(pntsd->dacloffset)));
Steve Frenchbcb02032007-09-25 16:17:24 +0000311#endif
312 rc = parse_sid(owner_sid_ptr, end_of_acl);
313 if (rc)
314 return rc;
315
316 rc = parse_sid(group_sid_ptr, end_of_acl);
317 if (rc)
318 return rc;
319
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000320 parse_dacl(dacl_ptr, end_of_acl);
321
Steve Frenchbcb02032007-09-25 16:17:24 +0000322/* 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)); */
328
Steve French297647c2007-10-12 04:11:59 +0000329
Steve Frenchbcb02032007-09-25 16:17:24 +0000330 return (0);
331}
Steve French297647c2007-10-12 04:11:59 +0000332#endif /* CONFIG_CIFS_EXPERIMENTAL */