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
|
/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - NT ACLs mapped to NFS4 ACLs, as per
http://www.suse.de/~agruen/nfs4acl/
Copyright (C) Andrew Tridgell 2006
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 "vfs_posix.h"
#include "lib/util/unix_privs.h"
#include "librpc/gen_ndr/ndr_nfs4acl.h"
#include "libcli/security/security.h"
#define ACE4_IDENTIFIER_GROUP 0x40
/*
load the current ACL from system.nfs4acl
*/
static NTSTATUS pvfs_acl_load_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
TALLOC_CTX *mem_ctx,
struct security_descriptor **psd)
{
NTSTATUS status;
struct nfs4acl *acl;
struct security_descriptor *sd;
int i, num_ids;
struct id_mapping *ids;
struct composite_context *ctx;
acl = talloc_zero(mem_ctx, struct nfs4acl);
NT_STATUS_HAVE_NO_MEMORY(acl);
status = pvfs_xattr_ndr_load(pvfs, mem_ctx, name->full_name, fd,
NFS4ACL_XATTR_NAME,
acl, ndr_pull_nfs4acl);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(acl);
return status;
}
*psd = security_descriptor_initialise(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(*psd);
sd = *psd;
sd->type |= acl->a_flags;
/* the number of ids to map is the acl count plus uid and gid */
num_ids = acl->a_count +2;
ids = talloc_array(sd, struct id_mapping, num_ids);
NT_STATUS_HAVE_NO_MEMORY(ids);
ids[0].unixid = talloc(ids, struct unixid);
NT_STATUS_HAVE_NO_MEMORY(ids[0].unixid);
ids[0].unixid->id = name->st.st_uid;
ids[0].unixid->type = ID_TYPE_UID;
ids[0].sid = NULL;
ids[0].status = NT_STATUS_NONE_MAPPED;
ids[1].unixid = talloc(ids, struct unixid);
NT_STATUS_HAVE_NO_MEMORY(ids[1].unixid);
ids[1].unixid->id = name->st.st_gid;
ids[1].unixid->type = ID_TYPE_GID;
ids[1].sid = NULL;
ids[1].status = NT_STATUS_NONE_MAPPED;
for (i=0;i<acl->a_count;i++) {
struct nfs4ace *a = &acl->ace[i];
ids[i+2].unixid = talloc(ids, struct unixid);
NT_STATUS_HAVE_NO_MEMORY(ids[i+2].unixid);
ids[i+2].unixid->id = a->e_id;
if (a->e_flags & ACE4_IDENTIFIER_GROUP) {
ids[i+2].unixid->type = ID_TYPE_GID;
} else {
ids[i+2].unixid->type = ID_TYPE_UID;
}
ids[i+2].sid = NULL;
ids[i+2].status = NT_STATUS_NONE_MAPPED;
}
/* Allocate memory for the sids from the security descriptor to be on
* the safe side. */
ctx = wbc_xids_to_sids_send(pvfs->wbc_ctx, sd, num_ids, ids);
NT_STATUS_HAVE_NO_MEMORY(ctx);
status = wbc_xids_to_sids_recv(ctx, &ids);
NT_STATUS_NOT_OK_RETURN(status);
sd->owner_sid = talloc_steal(sd, ids[0].sid);
sd->group_sid = talloc_steal(sd, ids[1].sid);
for (i=0;i<acl->a_count;i++) {
struct nfs4ace *a = &acl->ace[i];
struct security_ace ace;
ace.type = a->e_type;
ace.flags = a->e_flags;
ace.access_mask = a->e_mask;
ace.trustee = *ids[i+2].sid;
security_descriptor_dacl_add(sd, &ace);
}
return NT_STATUS_OK;
}
/*
save the acl for a file into system.nfs4acl
*/
static NTSTATUS pvfs_acl_save_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
struct security_descriptor *sd)
{
NTSTATUS status;
void *privs;
struct nfs4acl acl;
int i;
TALLOC_CTX *tmp_ctx;
struct id_mapping *ids;
struct composite_context *ctx;
tmp_ctx = talloc_new(pvfs);
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
acl.a_version = 0;
acl.a_flags = sd->type;
acl.a_count = sd->dacl?sd->dacl->num_aces:0;
acl.a_owner_mask = 0;
acl.a_group_mask = 0;
acl.a_other_mask = 0;
acl.ace = talloc_array(tmp_ctx, struct nfs4ace, acl.a_count);
if (!acl.ace) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
ids = talloc_array(tmp_ctx, struct id_mapping, acl.a_count);
if (ids == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
for (i=0;i<acl.a_count;i++) {
struct security_ace *ace = &sd->dacl->aces[i];
ids[i].unixid = NULL;
ids[i].sid = dom_sid_dup(ids, &ace->trustee);
if (ids[i].sid == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
ids[i].status = NT_STATUS_NONE_MAPPED;
}
ctx = wbc_sids_to_xids_send(pvfs->wbc_ctx,ids, acl.a_count, ids);
if (ctx == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
status = wbc_sids_to_xids_recv(ctx, &ids);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
return status;
}
for (i=0;i<acl.a_count;i++) {
struct nfs4ace *a = &acl.ace[i];
struct security_ace *ace = &sd->dacl->aces[i];
a->e_type = ace->type;
a->e_flags = ace->flags;
a->e_mask = ace->access_mask;
if (ids[i].unixid->type != ID_TYPE_UID) {
a->e_flags |= ACE4_IDENTIFIER_GROUP;
}
a->e_id = ids[i].unixid->id;
a->e_who = "";
}
privs = root_privileges();
status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
NFS4ACL_XATTR_NAME,
&acl, ndr_push_nfs4acl);
talloc_free(privs);
talloc_free(tmp_ctx);
return status;
}
/*
initialise pvfs acl NFS4 backend
*/
NTSTATUS pvfs_acl_nfs4_init(void)
{
struct pvfs_acl_ops ops = {
.name = "nfs4acl",
.acl_load = pvfs_acl_load_nfs4,
.acl_save = pvfs_acl_save_nfs4
};
return pvfs_acl_register(&ops);
}
|
