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Steve Frenchbcb02032007-09-25 16:17:24 +00001/*
2 * fs/cifs/cifsacl.c
3 *
Steve French8b1327f2008-03-14 22:37:16 +00004 * Copyright (C) International Business Machines Corp., 2007,2008
Steve Frenchbcb02032007-09-25 16:17:24 +00005 * 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"},
Steve French44093ca2007-10-23 21:22:55 +000041 {{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(546), 0, 0, 0} }, "guest"} }
42;
Steve French297647c2007-10-12 04:11:59 +000043
44
Steve Frenchbcb02032007-09-25 16:17:24 +000045/* security id for everyone */
Shirish Pargaonkare01b6402007-10-30 04:45:14 +000046static const struct cifs_sid sid_everyone = {
47 1, 1, {0, 0, 0, 0, 0, 1}, {0} };
Steve Frenchbcb02032007-09-25 16:17:24 +000048/* group users */
Steve Frenchad7a2922008-02-07 23:25:02 +000049static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} };
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +000050
Steve French297647c2007-10-12 04:11:59 +000051
52int match_sid(struct cifs_sid *ctsid)
53{
54 int i, j;
55 int num_subauth, num_sat, num_saw;
56 struct cifs_sid *cwsid;
57
58 if (!ctsid)
59 return (-1);
60
61 for (i = 0; i < NUM_WK_SIDS; ++i) {
62 cwsid = &(wksidarr[i].cifssid);
63
64 /* compare the revision */
65 if (ctsid->revision != cwsid->revision)
66 continue;
67
68 /* compare all of the six auth values */
69 for (j = 0; j < 6; ++j) {
70 if (ctsid->authority[j] != cwsid->authority[j])
71 break;
72 }
73 if (j < 6)
74 continue; /* all of the auth values did not match */
75
76 /* compare all of the subauth values if any */
Dave Kleikampce51ae12007-10-16 21:35:39 +000077 num_sat = ctsid->num_subauth;
78 num_saw = cwsid->num_subauth;
Steve French297647c2007-10-12 04:11:59 +000079 num_subauth = num_sat < num_saw ? num_sat : num_saw;
80 if (num_subauth) {
81 for (j = 0; j < num_subauth; ++j) {
82 if (ctsid->sub_auth[j] != cwsid->sub_auth[j])
83 break;
84 }
85 if (j < num_subauth)
86 continue; /* all sub_auth values do not match */
87 }
88
89 cFYI(1, ("matching sid: %s\n", wksidarr[i].sidname));
90 return (0); /* sids compare/match */
91 }
92
93 cFYI(1, ("No matching sid"));
94 return (-1);
95}
96
Steve Frencha750e772007-10-17 22:50:39 +000097/* if the two SIDs (roughly equivalent to a UUID for a user or group) are
98 the same returns 1, if they do not match returns 0 */
Steve French630f3f0c2007-10-25 21:17:17 +000099int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid)
Steve French297647c2007-10-12 04:11:59 +0000100{
101 int i;
102 int num_subauth, num_sat, num_saw;
103
104 if ((!ctsid) || (!cwsid))
Steve Frencha750e772007-10-17 22:50:39 +0000105 return (0);
Steve French297647c2007-10-12 04:11:59 +0000106
107 /* compare the revision */
108 if (ctsid->revision != cwsid->revision)
Steve Frencha750e772007-10-17 22:50:39 +0000109 return (0);
Steve French297647c2007-10-12 04:11:59 +0000110
111 /* compare all of the six auth values */
112 for (i = 0; i < 6; ++i) {
113 if (ctsid->authority[i] != cwsid->authority[i])
Steve Frencha750e772007-10-17 22:50:39 +0000114 return (0);
Steve French297647c2007-10-12 04:11:59 +0000115 }
116
117 /* compare all of the subauth values if any */
Steve Frenchadbc0352007-10-17 02:12:46 +0000118 num_sat = ctsid->num_subauth;
Steve Frenchadddd492007-10-17 02:48:17 +0000119 num_saw = cwsid->num_subauth;
Steve French297647c2007-10-12 04:11:59 +0000120 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])
Steve Frencha750e772007-10-17 22:50:39 +0000124 return (0);
Steve French297647c2007-10-12 04:11:59 +0000125 }
126 }
127
Steve Frencha750e772007-10-17 22:50:39 +0000128 return (1); /* sids compare/match */
Steve French297647c2007-10-12 04:11:59 +0000129}
130
Steve French97837582007-12-31 07:47:21 +0000131
132/* copy ntsd, owner sid, and group sid from a security descriptor to another */
133static void copy_sec_desc(const struct cifs_ntsd *pntsd,
134 struct cifs_ntsd *pnntsd, __u32 sidsoffset)
135{
136 int i;
137
138 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
139 struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr;
140
141 /* copy security descriptor control portion */
142 pnntsd->revision = pntsd->revision;
143 pnntsd->type = pntsd->type;
144 pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd));
145 pnntsd->sacloffset = 0;
146 pnntsd->osidoffset = cpu_to_le32(sidsoffset);
147 pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid));
148
149 /* copy owner sid */
150 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
151 le32_to_cpu(pntsd->osidoffset));
152 nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset);
153
154 nowner_sid_ptr->revision = owner_sid_ptr->revision;
155 nowner_sid_ptr->num_subauth = owner_sid_ptr->num_subauth;
156 for (i = 0; i < 6; i++)
157 nowner_sid_ptr->authority[i] = owner_sid_ptr->authority[i];
158 for (i = 0; i < 5; i++)
159 nowner_sid_ptr->sub_auth[i] = owner_sid_ptr->sub_auth[i];
160
161 /* copy group sid */
162 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
163 le32_to_cpu(pntsd->gsidoffset));
164 ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset +
165 sizeof(struct cifs_sid));
166
167 ngroup_sid_ptr->revision = group_sid_ptr->revision;
168 ngroup_sid_ptr->num_subauth = group_sid_ptr->num_subauth;
169 for (i = 0; i < 6; i++)
170 ngroup_sid_ptr->authority[i] = group_sid_ptr->authority[i];
171 for (i = 0; i < 5; i++)
172 ngroup_sid_ptr->sub_auth[i] =
173 cpu_to_le32(group_sid_ptr->sub_auth[i]);
174
175 return;
176}
177
178
Steve French630f3f0c2007-10-25 21:17:17 +0000179/*
180 change posix mode to reflect permissions
181 pmode is the existing mode (we only want to overwrite part of this
182 bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
183*/
Al Viro9b5e6852007-12-05 08:24:38 +0000184static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode,
Steve French15b03952007-11-08 17:57:40 +0000185 umode_t *pbits_to_set)
Steve French4879b442007-10-19 21:57:39 +0000186{
Al Viro9b5e6852007-12-05 08:24:38 +0000187 __u32 flags = le32_to_cpu(ace_flags);
Steve French15b03952007-11-08 17:57:40 +0000188 /* the order of ACEs is important. The canonical order is to begin with
Steve Frenchce06c9f2007-11-08 21:12:01 +0000189 DENY entries followed by ALLOW, otherwise an allow entry could be
Steve French15b03952007-11-08 17:57:40 +0000190 encountered first, making the subsequent deny entry like "dead code"
Steve Frenchce06c9f2007-11-08 21:12:01 +0000191 which would be superflous since Windows stops when a match is made
Steve French15b03952007-11-08 17:57:40 +0000192 for the operation you are trying to perform for your user */
193
194 /* For deny ACEs we change the mask so that subsequent allow access
195 control entries do not turn on the bits we are denying */
196 if (type == ACCESS_DENIED) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000197 if (flags & GENERIC_ALL)
Steve French15b03952007-11-08 17:57:40 +0000198 *pbits_to_set &= ~S_IRWXUGO;
Steve Frenchad7a2922008-02-07 23:25:02 +0000199
Al Viro9b5e6852007-12-05 08:24:38 +0000200 if ((flags & GENERIC_WRITE) ||
201 ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
Steve French15b03952007-11-08 17:57:40 +0000202 *pbits_to_set &= ~S_IWUGO;
Al Viro9b5e6852007-12-05 08:24:38 +0000203 if ((flags & GENERIC_READ) ||
204 ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
Steve French15b03952007-11-08 17:57:40 +0000205 *pbits_to_set &= ~S_IRUGO;
Al Viro9b5e6852007-12-05 08:24:38 +0000206 if ((flags & GENERIC_EXECUTE) ||
207 ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
Steve French15b03952007-11-08 17:57:40 +0000208 *pbits_to_set &= ~S_IXUGO;
209 return;
210 } else if (type != ACCESS_ALLOWED) {
211 cERROR(1, ("unknown access control type %d", type));
212 return;
213 }
214 /* else ACCESS_ALLOWED type */
Steve French44093ca2007-10-23 21:22:55 +0000215
Al Viro9b5e6852007-12-05 08:24:38 +0000216 if (flags & GENERIC_ALL) {
Steve French15b03952007-11-08 17:57:40 +0000217 *pmode |= (S_IRWXUGO & (*pbits_to_set));
Steve French90c81e02008-02-12 20:32:36 +0000218 cFYI(DBG2, ("all perms"));
Steve Frenchd61e5802007-10-26 04:32:43 +0000219 return;
220 }
Al Viro9b5e6852007-12-05 08:24:38 +0000221 if ((flags & GENERIC_WRITE) ||
222 ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
Steve French15b03952007-11-08 17:57:40 +0000223 *pmode |= (S_IWUGO & (*pbits_to_set));
Al Viro9b5e6852007-12-05 08:24:38 +0000224 if ((flags & GENERIC_READ) ||
225 ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
Steve French15b03952007-11-08 17:57:40 +0000226 *pmode |= (S_IRUGO & (*pbits_to_set));
Al Viro9b5e6852007-12-05 08:24:38 +0000227 if ((flags & GENERIC_EXECUTE) ||
228 ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
Steve French15b03952007-11-08 17:57:40 +0000229 *pmode |= (S_IXUGO & (*pbits_to_set));
Steve Frenchd61e5802007-10-26 04:32:43 +0000230
Steve French90c81e02008-02-12 20:32:36 +0000231 cFYI(DBG2, ("access flags 0x%x mode now 0x%x", flags, *pmode));
Steve French630f3f0c2007-10-25 21:17:17 +0000232 return;
233}
234
Steve Frenchce06c9f2007-11-08 21:12:01 +0000235/*
236 Generate access flags to reflect permissions mode is the existing mode.
237 This function is called for every ACE in the DACL whose SID matches
238 with either owner or group or everyone.
239*/
240
241static void mode_to_access_flags(umode_t mode, umode_t bits_to_use,
242 __u32 *pace_flags)
243{
244 /* reset access mask */
245 *pace_flags = 0x0;
246
247 /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */
248 mode &= bits_to_use;
249
250 /* check for R/W/X UGO since we do not know whose flags
251 is this but we have cleared all the bits sans RWX for
252 either user or group or other as per bits_to_use */
253 if (mode & S_IRUGO)
254 *pace_flags |= SET_FILE_READ_RIGHTS;
255 if (mode & S_IWUGO)
256 *pace_flags |= SET_FILE_WRITE_RIGHTS;
257 if (mode & S_IXUGO)
258 *pace_flags |= SET_FILE_EXEC_RIGHTS;
259
Steve French90c81e02008-02-12 20:32:36 +0000260 cFYI(DBG2, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags));
Steve Frenchce06c9f2007-11-08 21:12:01 +0000261 return;
262}
263
Al Viro2b210ad2008-03-29 03:09:18 +0000264static __u16 fill_ace_for_sid(struct cifs_ace *pntace,
Steve French97837582007-12-31 07:47:21 +0000265 const struct cifs_sid *psid, __u64 nmode, umode_t bits)
266{
267 int i;
268 __u16 size = 0;
269 __u32 access_req = 0;
270
271 pntace->type = ACCESS_ALLOWED;
272 pntace->flags = 0x0;
273 mode_to_access_flags(nmode, bits, &access_req);
274 if (!access_req)
275 access_req = SET_MINIMUM_RIGHTS;
276 pntace->access_req = cpu_to_le32(access_req);
277
278 pntace->sid.revision = psid->revision;
279 pntace->sid.num_subauth = psid->num_subauth;
280 for (i = 0; i < 6; i++)
281 pntace->sid.authority[i] = psid->authority[i];
282 for (i = 0; i < psid->num_subauth; i++)
283 pntace->sid.sub_auth[i] = psid->sub_auth[i];
284
285 size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4);
286 pntace->size = cpu_to_le16(size);
287
288 return (size);
289}
290
Steve French297647c2007-10-12 04:11:59 +0000291
Steve French953f8682007-10-31 04:54:42 +0000292#ifdef CONFIG_CIFS_DEBUG2
293static void dump_ace(struct cifs_ace *pace, char *end_of_acl)
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000294{
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000295 int num_subauth;
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000296
297 /* validate that we do not go past end of acl */
Steve French297647c2007-10-12 04:11:59 +0000298
Steve French44093ca2007-10-23 21:22:55 +0000299 if (le16_to_cpu(pace->size) < 16) {
300 cERROR(1, ("ACE too small, %d", le16_to_cpu(pace->size)));
301 return;
302 }
303
304 if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) {
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000305 cERROR(1, ("ACL too small to parse ACE"));
306 return;
Steve French44093ca2007-10-23 21:22:55 +0000307 }
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000308
Steve French44093ca2007-10-23 21:22:55 +0000309 num_subauth = pace->sid.num_subauth;
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000310 if (num_subauth) {
Steve French8f18c132007-10-12 18:54:12 +0000311 int i;
Steve French44093ca2007-10-23 21:22:55 +0000312 cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d",
313 pace->sid.revision, pace->sid.num_subauth, pace->type,
Steve French97837582007-12-31 07:47:21 +0000314 pace->flags, le16_to_cpu(pace->size)));
Steve Frenchd12fd122007-10-03 19:43:19 +0000315 for (i = 0; i < num_subauth; ++i) {
316 cFYI(1, ("ACE sub_auth[%d]: 0x%x", i,
Steve French44093ca2007-10-23 21:22:55 +0000317 le32_to_cpu(pace->sid.sub_auth[i])));
Steve Frenchd12fd122007-10-03 19:43:19 +0000318 }
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000319
Steve Frenchd12fd122007-10-03 19:43:19 +0000320 /* BB add length check to make sure that we do not have huge
321 num auths and therefore go off the end */
Steve Frenchd12fd122007-10-03 19:43:19 +0000322 }
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000323
Steve Frenchd12fd122007-10-03 19:43:19 +0000324 return;
325}
Steve French953f8682007-10-31 04:54:42 +0000326#endif
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000327
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000328
Steve Frencha750e772007-10-17 22:50:39 +0000329static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
Steve Frenchd61e5802007-10-26 04:32:43 +0000330 struct cifs_sid *pownersid, struct cifs_sid *pgrpsid,
Steve French630f3f0c2007-10-25 21:17:17 +0000331 struct inode *inode)
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000332{
333 int i;
334 int num_aces = 0;
335 int acl_size;
336 char *acl_base;
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000337 struct cifs_ace **ppace;
338
339 /* BB need to add parm so we can store the SID BB */
340
Steve French2b834572007-11-25 10:01:00 +0000341 if (!pdacl) {
342 /* no DACL in the security descriptor, set
343 all the permissions for user/group/other */
344 inode->i_mode |= S_IRWXUGO;
345 return;
346 }
347
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000348 /* validate that we do not go past end of acl */
Steve Frenchaf6f4612007-10-16 18:40:37 +0000349 if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000350 cERROR(1, ("ACL too small to parse DACL"));
351 return;
352 }
353
Steve French90c81e02008-02-12 20:32:36 +0000354 cFYI(DBG2, ("DACL revision %d size %d num aces %d",
Steve Frenchaf6f4612007-10-16 18:40:37 +0000355 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
356 le32_to_cpu(pdacl->num_aces)));
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000357
Steve French7505e052007-11-01 18:03:01 +0000358 /* reset rwx permissions for user/group/other.
359 Also, if num_aces is 0 i.e. DACL has no ACEs,
360 user/group/other have no permissions */
361 inode->i_mode &= ~(S_IRWXUGO);
362
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000363 acl_base = (char *)pdacl;
364 acl_size = sizeof(struct cifs_acl);
365
Steve Frenchadbc0352007-10-17 02:12:46 +0000366 num_aces = le32_to_cpu(pdacl->num_aces);
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000367 if (num_aces > 0) {
Steve French15b03952007-11-08 17:57:40 +0000368 umode_t user_mask = S_IRWXU;
369 umode_t group_mask = S_IRWXG;
370 umode_t other_mask = S_IRWXO;
371
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000372 ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
373 GFP_KERNEL);
374
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000375 for (i = 0; i < num_aces; ++i) {
Steve French44093ca2007-10-23 21:22:55 +0000376 ppace[i] = (struct cifs_ace *) (acl_base + acl_size);
Steve French953f8682007-10-31 04:54:42 +0000377#ifdef CONFIG_CIFS_DEBUG2
378 dump_ace(ppace[i], end_of_acl);
379#endif
Shirish Pargaonkare01b6402007-10-30 04:45:14 +0000380 if (compare_sids(&(ppace[i]->sid), pownersid))
381 access_flags_to_mode(ppace[i]->access_req,
Steve French15b03952007-11-08 17:57:40 +0000382 ppace[i]->type,
383 &(inode->i_mode),
384 &user_mask);
Shirish Pargaonkare01b6402007-10-30 04:45:14 +0000385 if (compare_sids(&(ppace[i]->sid), pgrpsid))
386 access_flags_to_mode(ppace[i]->access_req,
Steve French15b03952007-11-08 17:57:40 +0000387 ppace[i]->type,
388 &(inode->i_mode),
389 &group_mask);
Shirish Pargaonkare01b6402007-10-30 04:45:14 +0000390 if (compare_sids(&(ppace[i]->sid), &sid_everyone))
391 access_flags_to_mode(ppace[i]->access_req,
Steve French15b03952007-11-08 17:57:40 +0000392 ppace[i]->type,
393 &(inode->i_mode),
394 &other_mask);
Shirish Pargaonkare01b6402007-10-30 04:45:14 +0000395
Steve French44093ca2007-10-23 21:22:55 +0000396/* memcpy((void *)(&(cifscred->aces[i])),
Steve Frenchd12fd122007-10-03 19:43:19 +0000397 (void *)ppace[i],
398 sizeof(struct cifs_ace)); */
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000399
Steve French44093ca2007-10-23 21:22:55 +0000400 acl_base = (char *)ppace[i];
401 acl_size = le16_to_cpu(ppace[i]->size);
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000402 }
403
404 kfree(ppace);
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000405 }
406
407 return;
408}
409
Steve Frenchbcb02032007-09-25 16:17:24 +0000410
Steve French97837582007-12-31 07:47:21 +0000411static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
412 struct cifs_sid *pgrpsid, __u64 nmode)
413{
Al Viro2b210ad2008-03-29 03:09:18 +0000414 u16 size = 0;
Steve French97837582007-12-31 07:47:21 +0000415 struct cifs_acl *pnndacl;
416
417 pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl));
418
419 size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size),
420 pownersid, nmode, S_IRWXU);
421 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
422 pgrpsid, nmode, S_IRWXG);
423 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
424 &sid_everyone, nmode, S_IRWXO);
425
426 pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl));
Shirish Pargaonkard9f382e2008-02-12 20:46:26 +0000427 pndacl->num_aces = cpu_to_le32(3);
Steve French97837582007-12-31 07:47:21 +0000428
429 return (0);
430}
431
432
Steve Frenchbcb02032007-09-25 16:17:24 +0000433static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
434{
435 /* BB need to add parm so we can store the SID BB */
436
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000437 /* validate that we do not go past end of ACL - sid must be at least 8
438 bytes long (assuming no sub-auths - e.g. the null SID */
439 if (end_of_acl < (char *)psid + 8) {
440 cERROR(1, ("ACL too small to parse SID %p", psid));
Steve Frenchbcb02032007-09-25 16:17:24 +0000441 return -EINVAL;
442 }
Steve Frenchbcb02032007-09-25 16:17:24 +0000443
Steve Frenchaf6f4612007-10-16 18:40:37 +0000444 if (psid->num_subauth) {
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000445#ifdef CONFIG_CIFS_DEBUG2
Steve French8f18c132007-10-12 18:54:12 +0000446 int i;
Steve French44093ca2007-10-23 21:22:55 +0000447 cFYI(1, ("SID revision %d num_auth %d",
448 psid->revision, psid->num_subauth));
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000449
Steve Frenchaf6f4612007-10-16 18:40:37 +0000450 for (i = 0; i < psid->num_subauth; i++) {
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000451 cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
Steve French297647c2007-10-12 04:11:59 +0000452 le32_to_cpu(psid->sub_auth[i])));
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000453 }
454
Steve Frenchd12fd122007-10-03 19:43:19 +0000455 /* BB add length check to make sure that we do not have huge
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000456 num auths and therefore go off the end */
Steve Frenchd12fd122007-10-03 19:43:19 +0000457 cFYI(1, ("RID 0x%x",
Steve Frenchaf6f4612007-10-16 18:40:37 +0000458 le32_to_cpu(psid->sub_auth[psid->num_subauth-1])));
Steve Frenchbcb02032007-09-25 16:17:24 +0000459#endif
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000460 }
461
Steve Frenchbcb02032007-09-25 16:17:24 +0000462 return 0;
463}
464
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000465
Steve Frenchbcb02032007-09-25 16:17:24 +0000466/* Convert CIFS ACL to POSIX form */
Steve French630f3f0c2007-10-25 21:17:17 +0000467static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len,
468 struct inode *inode)
Steve Frenchbcb02032007-09-25 16:17:24 +0000469{
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000470 int rc;
Steve Frenchbcb02032007-09-25 16:17:24 +0000471 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
472 struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
Steve Frenchbcb02032007-09-25 16:17:24 +0000473 char *end_of_acl = ((char *)pntsd) + acl_len;
Steve French7505e052007-11-01 18:03:01 +0000474 __u32 dacloffset;
Steve Frenchbcb02032007-09-25 16:17:24 +0000475
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000476 if ((inode == NULL) || (pntsd == NULL))
477 return -EIO;
478
Steve Frenchbcb02032007-09-25 16:17:24 +0000479 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
Steve Frenchaf6f4612007-10-16 18:40:37 +0000480 le32_to_cpu(pntsd->osidoffset));
Steve Frenchbcb02032007-09-25 16:17:24 +0000481 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
Steve Frenchaf6f4612007-10-16 18:40:37 +0000482 le32_to_cpu(pntsd->gsidoffset));
Steve French7505e052007-11-01 18:03:01 +0000483 dacloffset = le32_to_cpu(pntsd->dacloffset);
Steve French63d25832007-11-05 21:46:10 +0000484 dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset);
Steve French90c81e02008-02-12 20:32:36 +0000485 cFYI(DBG2, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
Steve Frenchbcb02032007-09-25 16:17:24 +0000486 "sacloffset 0x%x dacloffset 0x%x",
Steve Frenchaf6f4612007-10-16 18:40:37 +0000487 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
488 le32_to_cpu(pntsd->gsidoffset),
Steve French7505e052007-11-01 18:03:01 +0000489 le32_to_cpu(pntsd->sacloffset), dacloffset));
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000490/* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */
Steve Frenchbcb02032007-09-25 16:17:24 +0000491 rc = parse_sid(owner_sid_ptr, end_of_acl);
492 if (rc)
493 return rc;
494
495 rc = parse_sid(group_sid_ptr, end_of_acl);
496 if (rc)
497 return rc;
498
Steve French7505e052007-11-01 18:03:01 +0000499 if (dacloffset)
500 parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr,
Steve French63d25832007-11-05 21:46:10 +0000501 group_sid_ptr, inode);
Steve French7505e052007-11-01 18:03:01 +0000502 else
503 cFYI(1, ("no ACL")); /* BB grant all or default perms? */
Shirish Pargaonkard0d66c42007-10-03 18:22:19 +0000504
Steve Frenchbcb02032007-09-25 16:17:24 +0000505/* cifscred->uid = owner_sid_ptr->rid;
506 cifscred->gid = group_sid_ptr->rid;
507 memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr,
Steve French630f3f0c2007-10-25 21:17:17 +0000508 sizeof(struct cifs_sid));
Steve Frenchbcb02032007-09-25 16:17:24 +0000509 memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
Steve French630f3f0c2007-10-25 21:17:17 +0000510 sizeof(struct cifs_sid)); */
Steve Frenchbcb02032007-09-25 16:17:24 +0000511
Steve French297647c2007-10-12 04:11:59 +0000512
Steve Frenchbcb02032007-09-25 16:17:24 +0000513 return (0);
514}
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000515
516
Steve French97837582007-12-31 07:47:21 +0000517/* Convert permission bits from mode to equivalent CIFS ACL */
518static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
Steve Frenchcce246e2008-04-09 20:55:31 +0000519 struct inode *inode, __u64 nmode)
Steve French97837582007-12-31 07:47:21 +0000520{
521 int rc = 0;
522 __u32 dacloffset;
523 __u32 ndacloffset;
524 __u32 sidsoffset;
525 struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
526 struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */
527 struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */
528
529 if ((inode == NULL) || (pntsd == NULL) || (pnntsd == NULL))
530 return (-EIO);
531
532 owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
533 le32_to_cpu(pntsd->osidoffset));
534 group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
535 le32_to_cpu(pntsd->gsidoffset));
536
537 dacloffset = le32_to_cpu(pntsd->dacloffset);
538 dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset);
539
540 ndacloffset = sizeof(struct cifs_ntsd);
541 ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset);
542 ndacl_ptr->revision = dacl_ptr->revision;
543 ndacl_ptr->size = 0;
544 ndacl_ptr->num_aces = 0;
545
546 rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, nmode);
547
548 sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size);
549
550 /* copy security descriptor control portion and owner and group sid */
551 copy_sec_desc(pntsd, pnntsd, sidsoffset);
552
553 return (rc);
554}
555
556
Steve French7505e052007-11-01 18:03:01 +0000557/* Retrieve an ACL from the server */
558static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
Steve French8b1327f2008-03-14 22:37:16 +0000559 const char *path, const __u16 *pfid)
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000560{
Steve French8b1327f2008-03-14 22:37:16 +0000561 struct cifsFileInfo *open_file = NULL;
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000562 int unlock_file = FALSE;
563 int xid;
564 int rc = -EIO;
565 __u16 fid;
566 struct super_block *sb;
567 struct cifs_sb_info *cifs_sb;
568 struct cifs_ntsd *pntsd = NULL;
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000569
570 cFYI(1, ("get mode from ACL for %s", path));
571
572 if (inode == NULL)
Steve French7505e052007-11-01 18:03:01 +0000573 return NULL;
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000574
575 xid = GetXid();
Steve French8b1327f2008-03-14 22:37:16 +0000576 if (pfid == NULL)
577 open_file = find_readable_file(CIFS_I(inode));
578 else
579 fid = *pfid;
580
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000581 sb = inode->i_sb;
582 if (sb == NULL) {
583 FreeXid(xid);
Steve French7505e052007-11-01 18:03:01 +0000584 return NULL;
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000585 }
586 cifs_sb = CIFS_SB(sb);
587
588 if (open_file) {
589 unlock_file = TRUE;
590 fid = open_file->netfid;
Steve French8b1327f2008-03-14 22:37:16 +0000591 } else if (pfid == NULL) {
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000592 int oplock = FALSE;
593 /* open file */
594 rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
Steve French953f8682007-10-31 04:54:42 +0000595 READ_CONTROL, 0, &fid, &oplock, NULL,
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000596 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
597 CIFS_MOUNT_MAP_SPECIAL_CHR);
598 if (rc != 0) {
599 cERROR(1, ("Unable to open file to get ACL"));
600 FreeXid(xid);
Steve French7505e052007-11-01 18:03:01 +0000601 return NULL;
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000602 }
603 }
604
Steve French7505e052007-11-01 18:03:01 +0000605 rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
606 cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
Steve French8b1327f2008-03-14 22:37:16 +0000607 if (unlock_file == TRUE) /* find_readable_file increments ref count */
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000608 atomic_dec(&open_file->wrtPending);
Steve French8b1327f2008-03-14 22:37:16 +0000609 else if (pfid == NULL) /* if opened above we have to close the handle */
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000610 CIFSSMBClose(xid, cifs_sb->tcon, fid);
Steve French8b1327f2008-03-14 22:37:16 +0000611 /* else handle was passed in by caller */
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000612
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000613 FreeXid(xid);
Steve French7505e052007-11-01 18:03:01 +0000614 return pntsd;
615}
616
Steve French97837582007-12-31 07:47:21 +0000617/* Set an ACL on the server */
618static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
619 struct inode *inode, const char *path)
620{
621 struct cifsFileInfo *open_file;
622 int unlock_file = FALSE;
623 int xid;
624 int rc = -EIO;
625 __u16 fid;
626 struct super_block *sb;
627 struct cifs_sb_info *cifs_sb;
628
Steve French90c81e02008-02-12 20:32:36 +0000629 cFYI(DBG2, ("set ACL for %s from mode 0x%x", path, inode->i_mode));
Steve French97837582007-12-31 07:47:21 +0000630
631 if (!inode)
632 return (rc);
633
634 sb = inode->i_sb;
635 if (sb == NULL)
636 return (rc);
637
638 cifs_sb = CIFS_SB(sb);
639 xid = GetXid();
640
641 open_file = find_readable_file(CIFS_I(inode));
642 if (open_file) {
643 unlock_file = TRUE;
644 fid = open_file->netfid;
645 } else {
646 int oplock = FALSE;
647 /* open file */
648 rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
649 WRITE_DAC, 0, &fid, &oplock, NULL,
650 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
651 CIFS_MOUNT_MAP_SPECIAL_CHR);
652 if (rc != 0) {
653 cERROR(1, ("Unable to open file to set ACL"));
654 FreeXid(xid);
655 return (rc);
656 }
657 }
658
659 rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
Steve French90c81e02008-02-12 20:32:36 +0000660 cFYI(DBG2, ("SetCIFSACL rc = %d", rc));
Steve French97837582007-12-31 07:47:21 +0000661 if (unlock_file == TRUE)
662 atomic_dec(&open_file->wrtPending);
663 else
664 CIFSSMBClose(xid, cifs_sb->tcon, fid);
665
666 FreeXid(xid);
667
668 return (rc);
669}
670
Steve French7505e052007-11-01 18:03:01 +0000671/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
Steve French8b1327f2008-03-14 22:37:16 +0000672void acl_to_uid_mode(struct inode *inode, const char *path, const __u16 *pfid)
Steve French7505e052007-11-01 18:03:01 +0000673{
674 struct cifs_ntsd *pntsd = NULL;
675 u32 acllen = 0;
676 int rc = 0;
677
Steve French90c81e02008-02-12 20:32:36 +0000678 cFYI(DBG2, ("converting ACL to mode for %s", path));
Steve French8b1327f2008-03-14 22:37:16 +0000679 pntsd = get_cifs_acl(&acllen, inode, path, pfid);
Steve French7505e052007-11-01 18:03:01 +0000680
681 /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */
682 if (pntsd)
683 rc = parse_sec_desc(pntsd, acllen, inode);
684 if (rc)
685 cFYI(1, ("parse sec desc failed rc = %d", rc));
686
687 kfree(pntsd);
Steve Frenchb9c7a2b2007-10-26 23:40:20 +0000688 return;
689}
Steve French953f8682007-10-31 04:54:42 +0000690
Steve French7505e052007-11-01 18:03:01 +0000691/* Convert mode bits to an ACL so we can update the ACL on the server */
Steve French97837582007-12-31 07:47:21 +0000692int mode_to_acl(struct inode *inode, const char *path, __u64 nmode)
Steve French953f8682007-10-31 04:54:42 +0000693{
694 int rc = 0;
Steve Frenchcce246e2008-04-09 20:55:31 +0000695 __u32 secdesclen = 0;
Steve French97837582007-12-31 07:47:21 +0000696 struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */
697 struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */
Steve French953f8682007-10-31 04:54:42 +0000698
Steve French90c81e02008-02-12 20:32:36 +0000699 cFYI(DBG2, ("set ACL from mode for %s", path));
Steve French953f8682007-10-31 04:54:42 +0000700
701 /* Get the security descriptor */
Steve Frenchcce246e2008-04-09 20:55:31 +0000702 pntsd = get_cifs_acl(&secdesclen, inode, path, NULL);
Steve French953f8682007-10-31 04:54:42 +0000703
Steve French97837582007-12-31 07:47:21 +0000704 /* Add three ACEs for owner, group, everyone getting rid of
705 other ACEs as chmod disables ACEs and set the security descriptor */
Steve French953f8682007-10-31 04:54:42 +0000706
Steve French97837582007-12-31 07:47:21 +0000707 if (pntsd) {
708 /* allocate memory for the smb header,
709 set security descriptor request security descriptor
710 parameters, and secuirty descriptor itself */
Steve French953f8682007-10-31 04:54:42 +0000711
Steve Frenchcce246e2008-04-09 20:55:31 +0000712 secdesclen = secdesclen < DEFSECDESCLEN ?
713 DEFSECDESCLEN : secdesclen;
714 pnntsd = kmalloc(secdesclen, GFP_KERNEL);
Steve French97837582007-12-31 07:47:21 +0000715 if (!pnntsd) {
716 cERROR(1, ("Unable to allocate security descriptor"));
717 kfree(pntsd);
718 return (-ENOMEM);
719 }
Steve French7505e052007-11-01 18:03:01 +0000720
Steve Frenchcce246e2008-04-09 20:55:31 +0000721 rc = build_sec_desc(pntsd, pnntsd, inode, nmode);
Steve French97837582007-12-31 07:47:21 +0000722
Steve French90c81e02008-02-12 20:32:36 +0000723 cFYI(DBG2, ("build_sec_desc rc: %d", rc));
Steve French97837582007-12-31 07:47:21 +0000724
725 if (!rc) {
726 /* Set the security descriptor */
Steve Frenchcce246e2008-04-09 20:55:31 +0000727 rc = set_cifs_acl(pnntsd, secdesclen, inode, path);
Steve French90c81e02008-02-12 20:32:36 +0000728 cFYI(DBG2, ("set_cifs_acl rc: %d", rc));
Steve French97837582007-12-31 07:47:21 +0000729 }
730
731 kfree(pnntsd);
732 kfree(pntsd);
733 }
734
735 return (rc);
Steve French953f8682007-10-31 04:54:42 +0000736}
Steve French297647c2007-10-12 04:11:59 +0000737#endif /* CONFIG_CIFS_EXPERIMENTAL */