summaryrefslogtreecommitdiffstats
path: root/source3/modules/vfs_zfsacl.c
blob: fbfe7794e703d68aea882641e16f2691d19bd34c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/*
 * Convert ZFS/NFSv4 acls to NT acls and vice versa.
 *
 * Copyright (C) Jiri Sasek, 2007
 * based on the foobar.c module which is copyrighted by Volker Lendecke
 *
 * Many thanks to Axel Apitz for help to fix the special ace's handling
 * issues.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "includes.h"
#include "system/filesys.h"
#include "smbd/smbd.h"
#include "nfs4_acls.h"

#if HAVE_FREEBSD_SUNACL_H
#include "sunacl.h"
#endif

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS

#define ZFSACL_MODULE_NAME "zfsacl"

/* zfs_get_nt_acl()
 * read the local file's acls and return it in NT form
 * using the NFSv4 format conversion
 */
static NTSTATUS zfs_get_nt_acl_common(const char *name,
				      uint32 security_info,
				      SMB4ACL_T **ppacl)
{
	int naces, i;
	ace_t *acebuf;
	SMB4ACL_T *pacl;
	TALLOC_CTX	*mem_ctx;

	/* read the number of file aces */
	if((naces = acl(name, ACE_GETACLCNT, 0, NULL)) == -1) {
		if(errno == ENOSYS) {
			DEBUG(9, ("acl(ACE_GETACLCNT, %s): Operation is not "
				  "supported on the filesystem where the file "
				  "reside\n", name));
		} else {
			DEBUG(9, ("acl(ACE_GETACLCNT, %s): %s ", name,
					strerror(errno)));
		}
		return map_nt_error_from_unix(errno);
	}
	/* allocate the field of ZFS aces */
	mem_ctx = talloc_tos();
	acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
	if(acebuf == NULL) {
		return NT_STATUS_NO_MEMORY;
	}
	/* read the aces into the field */
	if(acl(name, ACE_GETACL, naces, acebuf) < 0) {
		DEBUG(9, ("acl(ACE_GETACL, %s): %s ", name,
				strerror(errno)));
		return map_nt_error_from_unix(errno);
	}
	/* create SMB4ACL data */
	if((pacl = smb_create_smb4acl()) == NULL) {
		return NT_STATUS_NO_MEMORY;
	}
	for(i=0; i<naces; i++) {
		SMB_ACE4PROP_T aceprop;

		aceprop.aceType  = (uint32) acebuf[i].a_type;
		aceprop.aceFlags = (uint32) acebuf[i].a_flags;
		aceprop.aceMask  = (uint32) acebuf[i].a_access_mask;
		aceprop.who.id   = (uint32) acebuf[i].a_who;

		if(aceprop.aceFlags & ACE_OWNER) {
			aceprop.flags = SMB_ACE4_ID_SPECIAL;
			aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
		} else if(aceprop.aceFlags & ACE_GROUP) {
			aceprop.flags = SMB_ACE4_ID_SPECIAL;
			aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
		} else if(aceprop.aceFlags & ACE_EVERYONE) {
			aceprop.flags = SMB_ACE4_ID_SPECIAL;
			aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
		} else {
			aceprop.flags	= 0;
		}
		if(smb_add_ace4(pacl, &aceprop) == NULL)
			return NT_STATUS_NO_MEMORY;
	}

	*ppacl = pacl;
	return NT_STATUS_OK;
}

/* call-back function processing the NT acl -> ZFS acl using NFSv4 conv. */
static bool zfs_process_smbacl(files_struct *fsp, SMB4ACL_T *smbacl)
{
	int naces = smb_get_naces(smbacl), i;
	ace_t *acebuf;
	SMB4ACE_T *smbace;
	TALLOC_CTX	*mem_ctx;
	bool have_special_id = false;

	/* allocate the field of ZFS aces */
	mem_ctx = talloc_tos();
	acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
	if(acebuf == NULL) {
		errno = ENOMEM;
		return False;
	}
	/* handle all aces */
	for(smbace = smb_first_ace4(smbacl), i = 0;
			smbace!=NULL;
			smbace = smb_next_ace4(smbace), i++) {
		SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);

		acebuf[i].a_type        = aceprop->aceType;
		acebuf[i].a_flags       = aceprop->aceFlags;
		acebuf[i].a_access_mask = aceprop->aceMask;
		/* SYNC on acls is a no-op on ZFS.
		   See bug #7909. */
		acebuf[i].a_access_mask &= ~SMB_ACE4_SYNCHRONIZE;
		acebuf[i].a_who         = aceprop->who.id;
		if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
			switch(aceprop->who.special_id) {
			case SMB_ACE4_WHO_EVERYONE:
				acebuf[i].a_flags |= ACE_EVERYONE;
				break;
			case SMB_ACE4_WHO_OWNER:
				acebuf[i].a_flags |= ACE_OWNER;
				break;
			case SMB_ACE4_WHO_GROUP:
				acebuf[i].a_flags |= ACE_GROUP;
				break;
			default:
				DEBUG(8, ("unsupported special_id %d\n", \
					aceprop->who.special_id));
				continue; /* don't add it !!! */
			}
			have_special_id = true;
		}
	}

	if (!have_special_id
	    && lp_parm_bool(fsp->conn->params->service, "zfsacl",
			    "denymissingspecial", false)) {
		errno = EACCES;
		return false;
	}

	SMB_ASSERT(i == naces);

	/* store acl */
	if(acl(fsp->fsp_name->base_name, ACE_SETACL, naces, acebuf)) {
		if(errno == ENOSYS) {
			DEBUG(9, ("acl(ACE_SETACL, %s): Operation is not "
				  "supported on the filesystem where the file "
				  "reside", fsp_str_dbg(fsp)));
		} else {
			DEBUG(9, ("acl(ACE_SETACL, %s): %s ", fsp_str_dbg(fsp),
				  strerror(errno)));
		}
		return 0;
	}

	return True;
}

/* zfs_set_nt_acl()
 * set the local file's acls obtaining it in NT form
 * using the NFSv4 format conversion
 */
static NTSTATUS zfs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
			   uint32 security_info_sent,
			   const struct security_descriptor *psd)
{
	return smb_set_nt_acl_nfs4(fsp, security_info_sent, psd,
			zfs_process_smbacl);
}

static NTSTATUS zfsacl_fget_nt_acl(struct vfs_handle_struct *handle,
				 struct files_struct *fsp,
				 uint32 security_info,
				 struct security_descriptor **ppdesc)
{
	SMB4ACL_T *pacl;
	NTSTATUS status;

	status = zfs_get_nt_acl_common(fsp->fsp_name->base_name, security_info,
				       &pacl);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	return smb_fget_nt_acl_nfs4(fsp, security_info, ppdesc, pacl);
}

static NTSTATUS zfsacl_get_nt_acl(struct vfs_handle_struct *handle,
				const char *name,  uint32 security_info,
				struct security_descriptor **ppdesc)
{
	SMB4ACL_T *pacl;
	NTSTATUS status;

	status = zfs_get_nt_acl_common(name, security_info, &pacl);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	return smb_get_nt_acl_nfs4(handle->conn, name, security_info, ppdesc,
				   pacl);
}

static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
			 files_struct *fsp,
			 uint32 security_info_sent,
			 const struct security_descriptor *psd)
{
	return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
}

/* nils.goroll@hamburg.de 2008-06-16 :

   See also
   - https://bugzilla.samba.org/show_bug.cgi?id=5446
   - http://bugs.opensolaris.org/view_bug.do?bug_id=6688240

   Solaris supports NFSv4 and ZFS ACLs through a common system call, acl(2)
   with ACE_SETACL / ACE_GETACL / ACE_GETACLCNT, which is being wrapped for
   use by samba in this module.

   As the acl(2) interface is identical for ZFS and for NFS, this module,
   vfs_zfsacl, can not only be used for ZFS, but also for sharing NFSv4
   mounts on Solaris.

   But while "traditional" POSIX DRAFT ACLs (using acl(2) with SETACL
   / GETACL / GETACLCNT) fail for ZFS, the Solaris NFS client
   implemets a compatibility wrapper, which will make calls to
   traditional ACL calls though vfs_solarisacl succeed. As the
   compatibility wrapper's implementation is (by design) incomplete,
   we want to make sure that it is never being called.

   As long as Samba does not support an exiplicit method for a module
   to define conflicting vfs methods, we should override all conflicting
   methods here.

   For this to work, we need to make sure that this module is initialised
   *after* vfs_solarisacl

   Function declarations taken from vfs_solarisacl
*/

static SMB_ACL_T zfsacl_fail__sys_acl_get_file(vfs_handle_struct *handle,
					       const char *path_p,
					       SMB_ACL_TYPE_T type)
{
	return (SMB_ACL_T)NULL;
}

static SMB_ACL_T zfsacl_fail__sys_acl_get_fd(vfs_handle_struct *handle,
					     files_struct *fsp)
{
	return (SMB_ACL_T)NULL;
}

static int zfsacl_fail__sys_acl_set_file(vfs_handle_struct *handle,
					 const char *name,
					 SMB_ACL_TYPE_T type,
					 SMB_ACL_T theacl)
{
	return -1;
}

static int zfsacl_fail__sys_acl_set_fd(vfs_handle_struct *handle,
				       files_struct *fsp,
				       SMB_ACL_T theacl)
{
	return -1;
}

static int zfsacl_fail__sys_acl_delete_def_file(vfs_handle_struct *handle,
						const char *path)
{
	return -1;
}

/* VFS operations structure */

static struct vfs_fn_pointers zfsacl_fns = {
	.sys_acl_get_file = zfsacl_fail__sys_acl_get_file,
	.sys_acl_get_fd = zfsacl_fail__sys_acl_get_fd,
	.sys_acl_set_file = zfsacl_fail__sys_acl_set_file,
	.sys_acl_set_fd = zfsacl_fail__sys_acl_set_fd,
	.sys_acl_delete_def_file = zfsacl_fail__sys_acl_delete_def_file,
	.fget_nt_acl = zfsacl_fget_nt_acl,
	.get_nt_acl = zfsacl_get_nt_acl,
	.fset_nt_acl = zfsacl_fset_nt_acl,
};

NTSTATUS vfs_zfsacl_init(void);
NTSTATUS vfs_zfsacl_init(void)
{
	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
				&zfsacl_fns);
}