1 /*
2 Unix SMB/Netbios implementation.
3 VFS module to get and set posix acls
4 Copyright (C) Volker Lendecke 2006
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "includes.h"
21 #include "system/filesys.h"
22 #include "smbd/smbd.h"
23 #include "modules/vfs_posixacl.h"
24
25 /* prototypes for static functions first - for clarity */
26
27 static bool smb_ace_to_internal(acl_entry_t posix_ace,
28 struct smb_acl_entry *ace);
29 static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx);
30 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm);
31 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl);
32
33
34 /* public functions - the api */
35
posixacl_sys_acl_get_file(vfs_handle_struct * handle,const struct smb_filename * smb_fname,SMB_ACL_TYPE_T type,TALLOC_CTX * mem_ctx)36 SMB_ACL_T posixacl_sys_acl_get_file(vfs_handle_struct *handle,
37 const struct smb_filename *smb_fname,
38 SMB_ACL_TYPE_T type,
39 TALLOC_CTX *mem_ctx)
40 {
41 struct smb_acl_t *result;
42 acl_type_t acl_type;
43 acl_t acl;
44
45 switch(type) {
46 case SMB_ACL_TYPE_ACCESS:
47 acl_type = ACL_TYPE_ACCESS;
48 break;
49 case SMB_ACL_TYPE_DEFAULT:
50 acl_type = ACL_TYPE_DEFAULT;
51 break;
52 default:
53 errno = EINVAL;
54 return NULL;
55 }
56
57 acl = acl_get_file(smb_fname->base_name, acl_type);
58
59 if (acl == NULL) {
60 return NULL;
61 }
62
63 result = smb_acl_to_internal(acl, mem_ctx);
64 acl_free(acl);
65 return result;
66 }
67
posixacl_sys_acl_get_fd(vfs_handle_struct * handle,files_struct * fsp,TALLOC_CTX * mem_ctx)68 SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle,
69 files_struct *fsp, TALLOC_CTX *mem_ctx)
70 {
71 struct smb_acl_t *result;
72 acl_t acl = acl_get_fd(fsp->fh->fd);
73
74 if (acl == NULL) {
75 return NULL;
76 }
77
78 result = smb_acl_to_internal(acl, mem_ctx);
79 acl_free(acl);
80 return result;
81 }
82
posixacl_sys_acl_set_file(vfs_handle_struct * handle,const struct smb_filename * smb_fname,SMB_ACL_TYPE_T type,SMB_ACL_T theacl)83 int posixacl_sys_acl_set_file(vfs_handle_struct *handle,
84 const struct smb_filename *smb_fname,
85 SMB_ACL_TYPE_T type,
86 SMB_ACL_T theacl)
87 {
88 int res;
89 acl_type_t acl_type;
90 acl_t acl;
91
92 DEBUG(10, ("Calling acl_set_file: %s, %d\n",
93 smb_fname->base_name,
94 type));
95
96 switch(type) {
97 case SMB_ACL_TYPE_ACCESS:
98 acl_type = ACL_TYPE_ACCESS;
99 break;
100 case SMB_ACL_TYPE_DEFAULT:
101 acl_type = ACL_TYPE_DEFAULT;
102 break;
103 default:
104 errno = EINVAL;
105 return -1;
106 }
107
108 if ((acl = smb_acl_to_posix(theacl)) == NULL) {
109 return -1;
110 }
111 res = acl_set_file(smb_fname->base_name, acl_type, acl);
112 if (res != 0) {
113 DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno)));
114 }
115 acl_free(acl);
116 return res;
117 }
118
posixacl_sys_acl_set_fd(vfs_handle_struct * handle,files_struct * fsp,SMB_ACL_T theacl)119 int posixacl_sys_acl_set_fd(vfs_handle_struct *handle,
120 files_struct *fsp,
121 SMB_ACL_T theacl)
122 {
123 int res;
124 acl_t acl = smb_acl_to_posix(theacl);
125 if (acl == NULL) {
126 return -1;
127 }
128 res = acl_set_fd(fsp->fh->fd, acl);
129 acl_free(acl);
130 return res;
131 }
132
posixacl_sys_acl_delete_def_file(vfs_handle_struct * handle,const struct smb_filename * smb_fname)133 int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
134 const struct smb_filename *smb_fname)
135 {
136 return acl_delete_def_file(smb_fname->base_name);
137 }
138
139
140 /* private functions */
141
smb_ace_to_internal(acl_entry_t posix_ace,struct smb_acl_entry * ace)142 static bool smb_ace_to_internal(acl_entry_t posix_ace,
143 struct smb_acl_entry *ace)
144 {
145 acl_tag_t tag;
146 acl_permset_t permset;
147
148 if (acl_get_tag_type(posix_ace, &tag) != 0) {
149 DEBUG(0, ("smb_acl_get_tag_type failed\n"));
150 return False;
151 }
152
153 switch(tag) {
154 case ACL_USER:
155 ace->a_type = SMB_ACL_USER;
156 break;
157 case ACL_USER_OBJ:
158 ace->a_type = SMB_ACL_USER_OBJ;
159 break;
160 case ACL_GROUP:
161 ace->a_type = SMB_ACL_GROUP;
162 break;
163 case ACL_GROUP_OBJ:
164 ace->a_type = SMB_ACL_GROUP_OBJ;
165 break;
166 case ACL_OTHER:
167 ace->a_type = SMB_ACL_OTHER;
168 break;
169 case ACL_MASK:
170 ace->a_type = SMB_ACL_MASK;
171 break;
172 #ifdef HAVE_ACL_EVERYONE
173 case ACL_EVERYONE:
174 DEBUG(1, ("ACL tag type ACL_EVERYONE. FreeBSD with ZFS? Use 'vfs objects = zfsacl'\n"));
175 return false;
176 #endif
177 default:
178 DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag));
179 return False;
180 }
181 switch(ace->a_type) {
182 case SMB_ACL_USER: {
183 uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace);
184 if (puid == NULL) {
185 DEBUG(0, ("smb_acl_get_qualifier failed\n"));
186 return False;
187 }
188 ace->info.user.uid = *puid;
189 acl_free(puid);
190 break;
191 }
192
193 case SMB_ACL_GROUP: {
194 gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace);
195 if (pgid == NULL) {
196 DEBUG(0, ("smb_acl_get_qualifier failed\n"));
197 return False;
198 }
199 ace->info.group.gid = *pgid;
200 acl_free(pgid);
201 break;
202 }
203 default:
204 break;
205 }
206 if (acl_get_permset(posix_ace, &permset) != 0) {
207 DEBUG(0, ("smb_acl_get_mode failed\n"));
208 return False;
209 }
210 ace->a_perm = 0;
211 #ifdef HAVE_ACL_GET_PERM_NP
212 ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0);
213 ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
214 ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
215 #else
216 ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
217 ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
218 ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
219 #endif
220 return True;
221 }
222
smb_acl_to_internal(acl_t acl,TALLOC_CTX * mem_ctx)223 static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx)
224 {
225 struct smb_acl_t *result = sys_acl_init(mem_ctx);
226 int entry_id = ACL_FIRST_ENTRY;
227 acl_entry_t e;
228 if (result == NULL) {
229 return NULL;
230 }
231 while (acl_get_entry(acl, entry_id, &e) == 1) {
232
233 entry_id = ACL_NEXT_ENTRY;
234
235 result->acl = talloc_realloc(result, result->acl,
236 struct smb_acl_entry, result->count+1);
237 if (result->acl == NULL) {
238 TALLOC_FREE(result);
239 DEBUG(0, ("talloc_realloc failed\n"));
240 errno = ENOMEM;
241 return NULL;
242 }
243
244 if (!smb_ace_to_internal(e, &result->acl[result->count])) {
245 TALLOC_FREE(result);
246 return NULL;
247 }
248
249 result->count += 1;
250 }
251 return result;
252 }
253
smb_acl_set_mode(acl_entry_t entry,SMB_ACL_PERM_T perm)254 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm)
255 {
256 int ret;
257 acl_permset_t permset;
258
259 if ((ret = acl_get_permset(entry, &permset)) != 0) {
260 return ret;
261 }
262 if ((ret = acl_clear_perms(permset)) != 0) {
263 return ret;
264 }
265 if ((perm & SMB_ACL_READ) &&
266 ((ret = acl_add_perm(permset, ACL_READ)) != 0)) {
267 return ret;
268 }
269 if ((perm & SMB_ACL_WRITE) &&
270 ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) {
271 return ret;
272 }
273 if ((perm & SMB_ACL_EXECUTE) &&
274 ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) {
275 return ret;
276 }
277 return acl_set_permset(entry, permset);
278 }
279
smb_acl_to_posix(const struct smb_acl_t * acl)280 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl)
281 {
282 acl_t result;
283 int i;
284
285 result = acl_init(acl->count);
286 if (result == NULL) {
287 DEBUG(10, ("acl_init failed\n"));
288 return NULL;
289 }
290
291 for (i=0; i<acl->count; i++) {
292 const struct smb_acl_entry *entry = &acl->acl[i];
293 acl_entry_t e;
294 acl_tag_t tag;
295
296 if (acl_create_entry(&result, &e) != 0) {
297 DEBUG(1, ("acl_create_entry failed: %s\n",
298 strerror(errno)));
299 goto fail;
300 }
301
302 switch (entry->a_type) {
303 case SMB_ACL_USER:
304 tag = ACL_USER;
305 break;
306 case SMB_ACL_USER_OBJ:
307 tag = ACL_USER_OBJ;
308 break;
309 case SMB_ACL_GROUP:
310 tag = ACL_GROUP;
311 break;
312 case SMB_ACL_GROUP_OBJ:
313 tag = ACL_GROUP_OBJ;
314 break;
315 case SMB_ACL_OTHER:
316 tag = ACL_OTHER;
317 break;
318 case SMB_ACL_MASK:
319 tag = ACL_MASK;
320 break;
321 default:
322 DEBUG(1, ("Unknown tag value %d\n", entry->a_type));
323 goto fail;
324 }
325
326 if (acl_set_tag_type(e, tag) != 0) {
327 DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n",
328 tag, strerror(errno)));
329 goto fail;
330 }
331
332 switch (entry->a_type) {
333 case SMB_ACL_USER:
334 if (acl_set_qualifier(e, &entry->info.user.uid) != 0) {
335 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
336 strerror(errno)));
337 goto fail;
338 }
339 break;
340 case SMB_ACL_GROUP:
341 if (acl_set_qualifier(e, &entry->info.group.gid) != 0) {
342 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
343 strerror(errno)));
344 goto fail;
345 }
346 break;
347 default: /* Shut up, compiler! :-) */
348 break;
349 }
350
351 if (smb_acl_set_mode(e, entry->a_perm) != 0) {
352 goto fail;
353 }
354 }
355
356 if (acl_valid(result) != 0) {
357 char *acl_string = sys_acl_to_text(acl, NULL);
358 DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n",
359 acl_string, strerror(errno)));
360 SAFE_FREE(acl_string);
361 goto fail;
362 }
363
364 return result;
365
366 fail:
367 if (result != NULL) {
368 acl_free(result);
369 }
370 return NULL;
371 }
372
373 /* VFS operations structure */
374
375 static struct vfs_fn_pointers posixacl_fns = {
376 .sys_acl_get_file_fn = posixacl_sys_acl_get_file,
377 .sys_acl_get_fd_fn = posixacl_sys_acl_get_fd,
378 .sys_acl_blob_get_file_fn = posix_sys_acl_blob_get_file,
379 .sys_acl_blob_get_fd_fn = posix_sys_acl_blob_get_fd,
380 .sys_acl_set_file_fn = posixacl_sys_acl_set_file,
381 .sys_acl_set_fd_fn = posixacl_sys_acl_set_fd,
382 .sys_acl_delete_def_file_fn = posixacl_sys_acl_delete_def_file,
383 };
384
385 static_decl_vfs;
vfs_posixacl_init(TALLOC_CTX * ctx)386 NTSTATUS vfs_posixacl_init(TALLOC_CTX *ctx)
387 {
388 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
389 &posixacl_fns);
390 }
391