source: vendor/3.6.0/source3/modules/vfs_zfsacl.c

Last change on this file was 740, checked in by Silvan Scherrer, 13 years ago

Samba Server: update vendor to 3.6.0
File size: 9.1 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(const char *name,
44 uint32 security_info,
45 SMB4ACL_T **ppacl)
46{
47 int naces, i;
48 ace_t *acebuf;
49 SMB4ACL_T *pacl;
50 TALLOC_CTX *mem_ctx;
51
52 /* read the number of file aces */
53 if((naces = acl(name, ACE_GETACLCNT, 0, NULL)) == -1) {
54 if(errno == ENOSYS) {
55 DEBUG(9, ("acl(ACE_GETACLCNT, %s): Operation is not "
56 "supported on the filesystem where the file "
57 "reside", name));
58 } else {
59 DEBUG(9, ("acl(ACE_GETACLCNT, %s): %s ", name,
60 strerror(errno)));
61 }
62 return map_nt_error_from_unix(errno);
63 }
64 /* allocate the field of ZFS aces */
65 mem_ctx = talloc_tos();
66 acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
67 if(acebuf == NULL) {
68 return NT_STATUS_NO_MEMORY;
69 }
70 /* read the aces into the field */
71 if(acl(name, ACE_GETACL, naces, acebuf) < 0) {
72 DEBUG(9, ("acl(ACE_GETACL, %s): %s ", name,
73 strerror(errno)));
74 return map_nt_error_from_unix(errno);
75 }
76 /* create SMB4ACL data */
77 if((pacl = smb_create_smb4acl()) == NULL) {
78 return NT_STATUS_NO_MEMORY;
79 }
80 for(i=0; i<naces; i++) {
81 SMB_ACE4PROP_T aceprop;
82
83 aceprop.aceType = (uint32) acebuf[i].a_type;
84 aceprop.aceFlags = (uint32) acebuf[i].a_flags;
85 aceprop.aceMask = (uint32) acebuf[i].a_access_mask;
86 aceprop.who.id = (uint32) acebuf[i].a_who;
87
88 if(aceprop.aceFlags & ACE_OWNER) {
89 aceprop.flags = SMB_ACE4_ID_SPECIAL;
90 aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
91 } else if(aceprop.aceFlags & ACE_GROUP) {
92 aceprop.flags = SMB_ACE4_ID_SPECIAL;
93 aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
94 } else if(aceprop.aceFlags & ACE_EVERYONE) {
95 aceprop.flags = SMB_ACE4_ID_SPECIAL;
96 aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
97 } else {
98 aceprop.flags = 0;
99 }
100 if(smb_add_ace4(pacl, &aceprop) == NULL)
101 return NT_STATUS_NO_MEMORY;
102 }
103
104 *ppacl = pacl;
105 return NT_STATUS_OK;
106}
107
108/* call-back function processing the NT acl -> ZFS acl using NFSv4 conv. */
109static bool zfs_process_smbacl(files_struct *fsp, SMB4ACL_T *smbacl)
110{
111 int naces = smb_get_naces(smbacl), i;
112 ace_t *acebuf;
113 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;
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 security_info_sent,
188 const struct security_descriptor *psd)
189{
190 return smb_set_nt_acl_nfs4(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 security_info,
197 struct security_descriptor **ppdesc)
198{
199 SMB4ACL_T *pacl;
200 NTSTATUS status;
201
202 status = zfs_get_nt_acl_common(fsp->fsp_name->base_name, security_info,
203 &pacl);
204 if (!NT_STATUS_IS_OK(status)) {
205 return status;
206 }
207
208 return smb_fget_nt_acl_nfs4(fsp, security_info, ppdesc, pacl);
209}
210
211static NTSTATUS zfsacl_get_nt_acl(struct vfs_handle_struct *handle,
212 const char *name, uint32 security_info,
213 struct security_descriptor **ppdesc)
214{
215 SMB4ACL_T *pacl;
216 NTSTATUS status;
217
218 status = zfs_get_nt_acl_common(name, security_info, &pacl);
219 if (!NT_STATUS_IS_OK(status)) {
220 return status;
221 }
222
223 return smb_get_nt_acl_nfs4(handle->conn, name, security_info, ppdesc,
224 pacl);
225}
226
227static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
228 files_struct *fsp,
229 uint32 security_info_sent,
230 const struct security_descriptor *psd)
231{
232 return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
233}
234
235/* nils.goroll@hamburg.de 2008-06-16 :
236
237 See also
238 - https://bugzilla.samba.org/show_bug.cgi?id=5446
239 - http://bugs.opensolaris.org/view_bug.do?bug_id=6688240
240
241 Solaris supports NFSv4 and ZFS ACLs through a common system call, acl(2)
242 with ACE_SETACL / ACE_GETACL / ACE_GETACLCNT, which is being wrapped for
243 use by samba in this module.
244
245 As the acl(2) interface is identical for ZFS and for NFS, this module,
246 vfs_zfsacl, can not only be used for ZFS, but also for sharing NFSv4
247 mounts on Solaris.
248
249 But while "traditional" POSIX DRAFT ACLs (using acl(2) with SETACL
250 / GETACL / GETACLCNT) fail for ZFS, the Solaris NFS client
251 implemets a compatibility wrapper, which will make calls to
252 traditional ACL calls though vfs_solarisacl succeed. As the
253 compatibility wrapper's implementation is (by design) incomplete,
254 we want to make sure that it is never being called.
255
256 As long as Samba does not support an exiplicit method for a module
257 to define conflicting vfs methods, we should override all conflicting
258 methods here.
259
260 For this to work, we need to make sure that this module is initialised
261 *after* vfs_solarisacl
262
263 Function declarations taken from vfs_solarisacl
264*/
265
266static SMB_ACL_T zfsacl_fail__sys_acl_get_file(vfs_handle_struct *handle,
267 const char *path_p,
268 SMB_ACL_TYPE_T type)
269{
270 return (SMB_ACL_T)NULL;
271}
272
273static SMB_ACL_T zfsacl_fail__sys_acl_get_fd(vfs_handle_struct *handle,
274 files_struct *fsp)
275{
276 return (SMB_ACL_T)NULL;
277}
278
279static int zfsacl_fail__sys_acl_set_file(vfs_handle_struct *handle,
280 const char *name,
281 SMB_ACL_TYPE_T type,
282 SMB_ACL_T theacl)
283{
284 return -1;
285}
286
287static int zfsacl_fail__sys_acl_set_fd(vfs_handle_struct *handle,
288 files_struct *fsp,
289 SMB_ACL_T theacl)
290{
291 return -1;
292}
293
294static int zfsacl_fail__sys_acl_delete_def_file(vfs_handle_struct *handle,
295 const char *path)
296{
297 return -1;
298}
299
300/* VFS operations structure */
301
302static struct vfs_fn_pointers zfsacl_fns = {
303 .sys_acl_get_file = zfsacl_fail__sys_acl_get_file,
304 .sys_acl_get_fd = zfsacl_fail__sys_acl_get_fd,
305 .sys_acl_set_file = zfsacl_fail__sys_acl_set_file,
306 .sys_acl_set_fd = zfsacl_fail__sys_acl_set_fd,
307 .sys_acl_delete_def_file = zfsacl_fail__sys_acl_delete_def_file,
308 .fget_nt_acl = zfsacl_fget_nt_acl,
309 .get_nt_acl = zfsacl_get_nt_acl,
310 .fset_nt_acl = zfsacl_fset_nt_acl,
311};
312
313NTSTATUS vfs_zfsacl_init(void);
314NTSTATUS vfs_zfsacl_init(void)
315{
316 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
317 &zfsacl_fns);
318}
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