2 * Unix SMB/Netbios implementation.
3 * SEC_DESC handling functions
4 * Copyright (C) Jeremy R. Allison 1995-2003.
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.
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.
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/>.
22 /*******************************************************************
23 Create the share security tdb.
24 ********************************************************************/
26 static struct db_context
*share_db
; /* used for share security descriptors */
27 #define SHARE_DATABASE_VERSION_V1 1
28 #define SHARE_DATABASE_VERSION_V2 2 /* version id in little endian. */
30 /* Map generic permissions to file object specific permissions */
32 static const struct generic_mapping file_generic_mapping
= {
39 static int delete_fn(struct db_record
*rec
, void *priv
)
45 static bool share_info_db_init(void)
47 const char *vstring
= "INFO/version";
50 if (share_db
!= NULL
) {
54 share_db
= db_open_trans(NULL
, state_path("share_info.tdb"), 0,
55 TDB_DEFAULT
, O_RDWR
|O_CREAT
, 0600);
56 if (share_db
== NULL
) {
57 DEBUG(0,("Failed to open share info database %s (%s)\n",
58 state_path("share_info.tdb"), strerror(errno
) ));
62 vers_id
= dbwrap_fetch_int32(share_db
, vstring
);
63 if (vers_id
== SHARE_DATABASE_VERSION_V2
) {
67 if (share_db
->transaction_start(share_db
) != 0) {
68 DEBUG(0, ("transaction_start failed\n"));
69 TALLOC_FREE(share_db
);
73 vers_id
= dbwrap_fetch_int32(share_db
, vstring
);
74 if (vers_id
== SHARE_DATABASE_VERSION_V2
) {
78 if (share_db
->transaction_cancel(share_db
)) {
79 smb_panic("transaction_cancel failed");
84 /* Cope with byte-reversed older versions of the db. */
85 if ((vers_id
== SHARE_DATABASE_VERSION_V1
) || (IREV(vers_id
) == SHARE_DATABASE_VERSION_V1
)) {
86 /* Written on a bigendian machine with old fetch_int code. Save as le. */
88 if (dbwrap_store_int32(share_db
, vstring
,
89 SHARE_DATABASE_VERSION_V2
) != 0) {
90 DEBUG(0, ("dbwrap_store_int32 failed\n"));
93 vers_id
= SHARE_DATABASE_VERSION_V2
;
96 if (vers_id
!= SHARE_DATABASE_VERSION_V2
) {
98 ret
= share_db
->traverse(share_db
, delete_fn
, NULL
);
100 DEBUG(0, ("traverse failed\n"));
103 if (dbwrap_store_int32(share_db
, vstring
,
104 SHARE_DATABASE_VERSION_V2
) != 0) {
105 DEBUG(0, ("dbwrap_store_int32 failed\n"));
110 if (share_db
->transaction_commit(share_db
) != 0) {
111 DEBUG(0, ("transaction_commit failed\n"));
118 if (share_db
->transaction_cancel(share_db
)) {
119 smb_panic("transaction_cancel failed");
125 /*******************************************************************
126 Fake up a Everyone, default access as a default.
127 def_access is a GENERIC_XXX access mode.
128 ********************************************************************/
130 SEC_DESC
*get_share_security_default( TALLOC_CTX
*ctx
, size_t *psize
, uint32 def_access
)
135 SEC_DESC
*psd
= NULL
;
136 uint32 spec_access
= def_access
;
138 se_map_generic(&spec_access
, &file_generic_mapping
);
140 init_sec_access(&sa
, def_access
| spec_access
);
141 init_sec_ace(&ace
, &global_sid_World
, SEC_ACE_TYPE_ACCESS_ALLOWED
, sa
, 0);
143 if ((psa
= make_sec_acl(ctx
, NT4_ACL_REVISION
, 1, &ace
)) != NULL
) {
144 psd
= make_sec_desc(ctx
, SECURITY_DESCRIPTOR_REVISION_1
,
145 SEC_DESC_SELF_RELATIVE
, NULL
, NULL
, NULL
,
150 DEBUG(0,("get_share_security: Failed to make SEC_DESC.\n"));
157 /*******************************************************************
158 Pull a security descriptor from the share tdb.
159 ********************************************************************/
161 SEC_DESC
*get_share_security( TALLOC_CTX
*ctx
, const char *servicename
,
165 SEC_DESC
*psd
= NULL
;
169 if (!share_info_db_init()) {
173 if (!(key
= talloc_asprintf(ctx
, "SECDESC/%s", servicename
))) {
174 DEBUG(0, ("talloc_asprintf failed\n"));
178 data
= dbwrap_fetch_bystring(share_db
, talloc_tos(), key
);
182 if (data
.dptr
== NULL
) {
183 return get_share_security_default(ctx
, psize
,
187 status
= unmarshall_sec_desc(ctx
, data
.dptr
, data
.dsize
, &psd
);
189 TALLOC_FREE(data
.dptr
);
191 if (!NT_STATUS_IS_OK(status
)) {
192 DEBUG(0, ("unmarshall_sec_desc failed: %s\n",
198 *psize
= ndr_size_security_descriptor(psd
, 0);
203 /*******************************************************************
204 Store a security descriptor in the share db.
205 ********************************************************************/
207 bool set_share_security(const char *share_name
, SEC_DESC
*psd
)
215 if (!share_info_db_init()) {
219 frame
= talloc_stackframe();
221 status
= marshall_sec_desc(frame
, psd
, &blob
.dptr
, &blob
.dsize
);
223 if (!NT_STATUS_IS_OK(status
)) {
224 DEBUG(0, ("marshall_sec_desc failed: %s\n",
229 if (!(key
= talloc_asprintf(frame
, "SECDESC/%s", share_name
))) {
230 DEBUG(0, ("talloc_asprintf failed\n"));
234 status
= dbwrap_trans_store(share_db
, string_term_tdb_data(key
), blob
,
236 if (!NT_STATUS_IS_OK(status
)) {
237 DEBUG(1, ("set_share_security: Failed to store secdesc for "
238 "%s: %s\n", share_name
, nt_errstr(status
)));
242 DEBUG(5,("set_share_security: stored secdesc for %s\n", share_name
));
250 /*******************************************************************
251 Delete a security descriptor.
252 ********************************************************************/
254 bool delete_share_security(const char *servicename
)
260 if (!(key
= talloc_asprintf(talloc_tos(), "SECDESC/%s",
264 kbuf
= string_term_tdb_data(key
);
266 status
= dbwrap_trans_delete(share_db
, kbuf
);
267 if (!NT_STATUS_IS_OK(status
)) {
268 DEBUG(0, ("delete_share_security: Failed to delete entry for "
269 "share %s: %s\n", servicename
, nt_errstr(status
)));
276 /*******************************************************************
277 Can this user access with share with the required permissions ?
278 ********************************************************************/
280 bool share_access_check(const NT_USER_TOKEN
*token
, const char *sharename
,
281 uint32 desired_access
)
285 SEC_DESC
*psd
= NULL
;
289 psd
= get_share_security(talloc_tos(), sharename
, &sd_size
);
295 ret
= se_access_check(psd
, token
, desired_access
, &granted
, &status
);
302 /***************************************************************************
303 Parse the contents of an acl string from a usershare file.
304 ***************************************************************************/
306 bool parse_usershare_acl(TALLOC_CTX
*ctx
, const char *acl_str
, SEC_DESC
**ppsd
)
309 const char *pacl
= acl_str
;
311 SEC_ACE
*ace_list
= NULL
;
313 SEC_DESC
*psd
= NULL
;
319 /* If the acl string is blank return "Everyone:R" */
321 SEC_DESC
*default_psd
= get_share_security_default(ctx
, &s_size
, GENERIC_READ_ACCESS
);
331 /* Add the number of ',' characters to get the number of aces. */
332 num_aces
+= count_chars(pacl
,',');
334 ace_list
= TALLOC_ARRAY(ctx
, SEC_ACE
, num_aces
);
339 for (i
= 0; i
< num_aces
; i
++) {
345 enum security_ace_type type
= SEC_ACE_TYPE_ACCESS_ALLOWED
;
347 if (!next_token_talloc(ctx
, &pacl
, &sidstr
, ":")) {
348 DEBUG(0,("parse_usershare_acl: malformed usershare acl looking "
349 "for ':' in string '%s'\n", pacl
));
353 if (!string_to_sid(&sid
, sidstr
)) {
354 DEBUG(0,("parse_usershare_acl: failed to convert %s to sid.\n",
360 case 'F': /* Full Control, ie. R+W */
361 case 'f': /* Full Control, ie. R+W */
362 s_access
= g_access
= GENERIC_ALL_ACCESS
;
364 case 'R': /* Read only. */
365 case 'r': /* Read only. */
366 s_access
= g_access
= GENERIC_READ_ACCESS
;
368 case 'D': /* Deny all to this SID. */
369 case 'd': /* Deny all to this SID. */
370 type
= SEC_ACE_TYPE_ACCESS_DENIED
;
371 s_access
= g_access
= GENERIC_ALL_ACCESS
;
374 DEBUG(0,("parse_usershare_acl: unknown acl type at %s.\n",
380 if (*pacl
&& *pacl
!= ',') {
381 DEBUG(0,("parse_usershare_acl: bad acl string at %s.\n",
385 pacl
++; /* Go past any ',' */
387 se_map_generic(&s_access
, &file_generic_mapping
);
388 init_sec_access(&sa
, g_access
| s_access
);
389 init_sec_ace(&ace_list
[i
], &sid
, type
, sa
, 0);
392 if ((psa
= make_sec_acl(ctx
, NT4_ACL_REVISION
, num_aces
, ace_list
)) != NULL
) {
393 psd
= make_sec_desc(ctx
, SECURITY_DESCRIPTOR_REVISION_1
,
394 SEC_DESC_SELF_RELATIVE
, NULL
, NULL
, NULL
,
399 DEBUG(0,("parse_usershare_acl: Failed to make SEC_DESC.\n"));