source: vendor/current/source3/modules/vfs_zfsacl.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 9.8 KB
Line 
1/*
2 * Convert ZFS/NFSv4 acls to NT acls and vice versa.
3 *
4 * Copyright (C) Jiri Sasek, 2007
5 * based on the foobar.c module which is copyrighted by Volker Lendecke
6 *
7 * Many thanks to Axel Apitz for help to fix the special ace's handling
8 * issues.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see <http://www.gnu.org/licenses/>.
22 *
23 */
24
25#include "includes.h"
26#include "system/filesys.h"
27#include "smbd/smbd.h"
28#include "nfs4_acls.h"
29
30#if HAVE_FREEBSD_SUNACL_H
31#include "sunacl.h"
32#endif
33
34#undef DBGC_CLASS
35#define DBGC_CLASS DBGC_VFS
36
37#define ZFSACL_MODULE_NAME "zfsacl"
38
39/* zfs_get_nt_acl()
40 * read the local file's acls and return it in NT form
41 * using the NFSv4 format conversion
42 */
43static NTSTATUS zfs_get_nt_acl_common(TALLOC_CTX *mem_ctx,
44 const char *name,
45 struct SMB4ACL_T **ppacl)
46{
47 int naces, i;
48 ace_t *acebuf;
49 struct SMB4ACL_T *pacl;
50
51 /* read the number of file aces */
52 if((naces = acl(name, ACE_GETACLCNT, 0, NULL)) == -1) {
53 if(errno == ENOSYS) {
54 DEBUG(9, ("acl(ACE_GETACLCNT, %s): Operation is not "
55 "supported on the filesystem where the file "
56 "reside\n", name));
57 } else {
58 DEBUG(9, ("acl(ACE_GETACLCNT, %s): %s ", name,
59 strerror(errno)));
60 }
61 return map_nt_error_from_unix(errno);
62 }
63 /* allocate the field of ZFS aces */
64 mem_ctx = talloc_tos();
65 acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
66 if(acebuf == NULL) {
67 return NT_STATUS_NO_MEMORY;
68 }
69 /* read the aces into the field */
70 if(acl(name, ACE_GETACL, naces, acebuf) < 0) {
71 DEBUG(9, ("acl(ACE_GETACL, %s): %s ", name,
72 strerror(errno)));
73 return map_nt_error_from_unix(errno);
74 }
75 /* create SMB4ACL data */
76 if((pacl = smb_create_smb4acl(mem_ctx)) == NULL) {
77 return NT_STATUS_NO_MEMORY;
78 }
79 for(i=0; i<naces; i++) {
80 SMB_ACE4PROP_T aceprop;
81
82 aceprop.aceType = (uint32_t) acebuf[i].a_type;
83 aceprop.aceFlags = (uint32_t) acebuf[i].a_flags;
84 aceprop.aceMask = (uint32_t) acebuf[i].a_access_mask;
85 aceprop.who.id = (uint32_t) acebuf[i].a_who;
86
87 if(aceprop.aceFlags & ACE_OWNER) {
88 aceprop.flags = SMB_ACE4_ID_SPECIAL;
89 aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
90 } else if(aceprop.aceFlags & ACE_GROUP) {
91 aceprop.flags = SMB_ACE4_ID_SPECIAL;
92 aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
93 } else if(aceprop.aceFlags & ACE_EVERYONE) {
94 aceprop.flags = SMB_ACE4_ID_SPECIAL;
95 aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
96 } else {
97 aceprop.flags = 0;
98 }
99 if(smb_add_ace4(pacl, &aceprop) == NULL)
100 return NT_STATUS_NO_MEMORY;
101 }
102
103 *ppacl = pacl;
104 return NT_STATUS_OK;
105}
106
107/* call-back function processing the NT acl -> ZFS acl using NFSv4 conv. */
108static bool zfs_process_smbacl(vfs_handle_struct *handle, files_struct *fsp,
109 struct SMB4ACL_T *smbacl)
110{
111 int naces = smb_get_naces(smbacl), i;
112 ace_t *acebuf;
113 struct SMB4ACE_T *smbace;
114 TALLOC_CTX *mem_ctx;
115 bool have_special_id = false;
116
117 /* allocate the field of ZFS aces */
118 mem_ctx = talloc_tos();
119 acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
120 if(acebuf == NULL) {
121 errno = ENOMEM;
122 return False;
123 }
124 /* handle all aces */
125 for(smbace = smb_first_ace4(smbacl), i = 0;
126 smbace!=NULL;
127 smbace = smb_next_ace4(smbace), i++) {
128 SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);
129
130 acebuf[i].a_type = aceprop->aceType;
131 acebuf[i].a_flags = aceprop->aceFlags;
132 acebuf[i].a_access_mask = aceprop->aceMask;
133 /* SYNC on acls is a no-op on ZFS.
134 See bug #7909. */
135 acebuf[i].a_access_mask &= ~SMB_ACE4_SYNCHRONIZE;
136 acebuf[i].a_who = aceprop->who.id;
137 if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
138 switch(aceprop->who.special_id) {
139 case SMB_ACE4_WHO_EVERYONE:
140 acebuf[i].a_flags |= ACE_EVERYONE;
141 break;
142 case SMB_ACE4_WHO_OWNER:
143 acebuf[i].a_flags |= ACE_OWNER;
144 break;
145 case SMB_ACE4_WHO_GROUP:
146 acebuf[i].a_flags |= ACE_GROUP|ACE_IDENTIFIER_GROUP;
147 break;
148 default:
149 DEBUG(8, ("unsupported special_id %d\n", \
150 aceprop->who.special_id));
151 continue; /* don't add it !!! */
152 }
153 have_special_id = true;
154 }
155 }
156
157 if (!have_special_id
158 && lp_parm_bool(fsp->conn->params->service, "zfsacl",
159 "denymissingspecial", false)) {
160 errno = EACCES;
161 return false;
162 }
163
164 SMB_ASSERT(i == naces);
165
166 /* store acl */
167 if(acl(fsp->fsp_name->base_name, ACE_SETACL, naces, acebuf)) {
168 if(errno == ENOSYS) {
169 DEBUG(9, ("acl(ACE_SETACL, %s): Operation is not "
170 "supported on the filesystem where the file "
171 "reside", fsp_str_dbg(fsp)));
172 } else {
173 DEBUG(9, ("acl(ACE_SETACL, %s): %s ", fsp_str_dbg(fsp),
174 strerror(errno)));
175 }
176 return 0;
177 }
178
179 return True;
180}
181
182/* zfs_set_nt_acl()
183 * set the local file's acls obtaining it in NT form
184 * using the NFSv4 format conversion
185 */
186static NTSTATUS zfs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
187 uint32_t security_info_sent,
188 const struct security_descriptor *psd)
189{
190 return smb_set_nt_acl_nfs4(handle, fsp, security_info_sent, psd,
191 zfs_process_smbacl);
192}
193
194static NTSTATUS zfsacl_fget_nt_acl(struct vfs_handle_struct *handle,
195 struct files_struct *fsp,
196 uint32_t security_info,
197 TALLOC_CTX *mem_ctx,
198 struct security_descriptor **ppdesc)
199{
200 struct SMB4ACL_T *pacl;
201 NTSTATUS status;
202 TALLOC_CTX *frame = talloc_stackframe();
203
204 status = zfs_get_nt_acl_common(frame,
205 fsp->fsp_name->base_name,
206 &pacl);
207 if (!NT_STATUS_IS_OK(status)) {
208 TALLOC_FREE(frame);
209 return status;
210 }
211
212 status = smb_fget_nt_acl_nfs4(fsp, security_info, mem_ctx, ppdesc, pacl);
213 TALLOC_FREE(frame);
214 return status;
215}
216
217static NTSTATUS zfsacl_get_nt_acl(struct vfs_handle_struct *handle,
218 const char *name, uint32_t security_info,
219 TALLOC_CTX *mem_ctx,
220 struct security_descriptor **ppdesc)
221{
222 struct SMB4ACL_T *pacl;
223 NTSTATUS status;
224 TALLOC_CTX *frame = talloc_stackframe();
225
226 status = zfs_get_nt_acl_common(frame, name, &pacl);
227 if (!NT_STATUS_IS_OK(status)) {
228 TALLOC_FREE(frame);
229 return status;
230 }
231
232 status = smb_get_nt_acl_nfs4(handle->conn, name, security_info,
233 mem_ctx, ppdesc,
234 pacl);
235 TALLOC_FREE(frame);
236 return status;
237}
238
239static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
240 files_struct *fsp,
241 uint32_t security_info_sent,
242 const struct security_descriptor *psd)
243{
244 return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
245}
246
247/* nils.goroll@hamburg.de 2008-06-16 :
248
249 See also
250 - https://bugzilla.samba.org/show_bug.cgi?id=5446
251 - http://bugs.opensolaris.org/view_bug.do?bug_id=6688240
252
253 Solaris supports NFSv4 and ZFS ACLs through a common system call, acl(2)
254 with ACE_SETACL / ACE_GETACL / ACE_GETACLCNT, which is being wrapped for
255 use by samba in this module.
256
257 As the acl(2) interface is identical for ZFS and for NFS, this module,
258 vfs_zfsacl, can not only be used for ZFS, but also for sharing NFSv4
259 mounts on Solaris.
260
261 But while "traditional" POSIX DRAFT ACLs (using acl(2) with SETACL
262 / GETACL / GETACLCNT) fail for ZFS, the Solaris NFS client
263 implemets a compatibility wrapper, which will make calls to
264 traditional ACL calls though vfs_solarisacl succeed. As the
265 compatibility wrapper's implementation is (by design) incomplete,
266 we want to make sure that it is never being called.
267
268 As long as Samba does not support an exiplicit method for a module
269 to define conflicting vfs methods, we should override all conflicting
270 methods here.
271
272 For this to work, we need to make sure that this module is initialised
273 *after* vfs_solarisacl
274
275 Function declarations taken from vfs_solarisacl
276*/
277
278static SMB_ACL_T zfsacl_fail__sys_acl_get_file(vfs_handle_struct *handle,
279 const char *path_p,
280 SMB_ACL_TYPE_T type,
281 TALLOC_CTX *mem_ctx)
282{
283 return (SMB_ACL_T)NULL;
284}
285
286static SMB_ACL_T zfsacl_fail__sys_acl_get_fd(vfs_handle_struct *handle,
287 files_struct *fsp,
288 TALLOC_CTX *mem_ctx)
289{
290 return (SMB_ACL_T)NULL;
291}
292
293static int zfsacl_fail__sys_acl_set_file(vfs_handle_struct *handle,
294 const char *name,
295 SMB_ACL_TYPE_T type,
296 SMB_ACL_T theacl)
297{
298 return -1;
299}
300
301static int zfsacl_fail__sys_acl_set_fd(vfs_handle_struct *handle,
302 files_struct *fsp,
303 SMB_ACL_T theacl)
304{
305 return -1;
306}
307
308static int zfsacl_fail__sys_acl_delete_def_file(vfs_handle_struct *handle,
309 const char *path)
310{
311 return -1;
312}
313
314static int zfsacl_fail__sys_acl_blob_get_file(vfs_handle_struct *handle, const char *path_p, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
315{
316 return -1;
317}
318
319static int zfsacl_fail__sys_acl_blob_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
320{
321 return -1;
322}
323
324/* VFS operations structure */
325
326static struct vfs_fn_pointers zfsacl_fns = {
327 .sys_acl_get_file_fn = zfsacl_fail__sys_acl_get_file,
328 .sys_acl_get_fd_fn = zfsacl_fail__sys_acl_get_fd,
329 .sys_acl_blob_get_file_fn = zfsacl_fail__sys_acl_blob_get_file,
330 .sys_acl_blob_get_fd_fn = zfsacl_fail__sys_acl_blob_get_fd,
331 .sys_acl_set_file_fn = zfsacl_fail__sys_acl_set_file,
332 .sys_acl_set_fd_fn = zfsacl_fail__sys_acl_set_fd,
333 .sys_acl_delete_def_file_fn = zfsacl_fail__sys_acl_delete_def_file,
334 .fget_nt_acl_fn = zfsacl_fget_nt_acl,
335 .get_nt_acl_fn = zfsacl_get_nt_acl,
336 .fset_nt_acl_fn = zfsacl_fset_nt_acl,
337};
338
339NTSTATUS vfs_zfsacl_init(void);
340NTSTATUS vfs_zfsacl_init(void)
341{
342 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
343 &zfsacl_fns);
344}
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