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 2 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, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 /*******************************************************************
24 Create the share security tdb.
25 ********************************************************************/
27 static TDB_CONTEXT *share_tdb; /* used for share security descriptors */
28 #define SHARE_DATABASE_VERSION_V1 1
29 #define SHARE_DATABASE_VERSION_V2 2 /* version id in little endian. */
31 /* Map generic permissions to file object specific permissions */
33 static struct generic_mapping file_generic_mapping = {
41 BOOL share_info_db_init(void)
43 const char *vstring = "INFO/version";
50 share_tdb = tdb_open_log(lock_path("share_info.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
52 DEBUG(0,("Failed to open share info database %s (%s)\n",
53 lock_path("share_info.tdb"), strerror(errno) ));
57 /* handle a Samba upgrade */
58 tdb_lock_bystring(share_tdb, vstring, 0);
60 /* Cope with byte-reversed older versions of the db. */
61 vers_id = tdb_fetch_int32(share_tdb, vstring);
62 if ((vers_id == SHARE_DATABASE_VERSION_V1) || (IREV(vers_id) == SHARE_DATABASE_VERSION_V1)) {
63 /* Written on a bigendian machine with old fetch_int code. Save as le. */
64 tdb_store_int32(share_tdb, vstring, SHARE_DATABASE_VERSION_V2);
65 vers_id = SHARE_DATABASE_VERSION_V2;
68 if (vers_id != SHARE_DATABASE_VERSION_V2) {
69 tdb_traverse(share_tdb, tdb_traverse_delete_fn, NULL);
70 tdb_store_int32(share_tdb, vstring, SHARE_DATABASE_VERSION_V2);
72 tdb_unlock_bystring(share_tdb, vstring);
77 /*******************************************************************
78 Fake up a Everyone, default access as a default.
79 def_access is a GENERIC_XXX access mode.
80 ********************************************************************/
82 SEC_DESC *get_share_security_default( TALLOC_CTX *ctx, size_t *psize, uint32 def_access)
88 uint32 spec_access = def_access;
90 se_map_generic(&spec_access, &file_generic_mapping);
92 init_sec_access(&sa, def_access | spec_access );
93 init_sec_ace(&ace, &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED, sa, 0);
95 if ((psa = make_sec_acl(ctx, NT4_ACL_REVISION, 1, &ace)) != NULL) {
96 psd = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL, psa, psize);
100 DEBUG(0,("get_share_security: Failed to make SEC_DESC.\n"));
107 /*******************************************************************
108 Pull a security descriptor from the share tdb.
109 ********************************************************************/
111 SEC_DESC *get_share_security( TALLOC_CTX *ctx, int snum, size_t *psize)
115 SEC_DESC *psd = NULL;
117 if (!share_info_db_init()) {
123 /* Fetch security descriptor from tdb */
125 slprintf(key, sizeof(key)-1, "SECDESC/%s", lp_servicename(snum));
127 if (tdb_prs_fetch(share_tdb, key, &ps, ctx)!=0 ||
128 !sec_io_desc("get_share_security", &psd, &ps, 1)) {
130 DEBUG(4,("get_share_security: using default secdesc for %s\n", lp_servicename(snum) ));
132 return get_share_security_default(ctx, psize, GENERIC_ALL_ACCESS);
136 *psize = sec_desc_size(psd);
142 /*******************************************************************
143 Store a security descriptor in the share db.
144 ********************************************************************/
146 BOOL set_share_security(TALLOC_CTX *ctx, const char *share_name, SEC_DESC *psd)
149 TALLOC_CTX *mem_ctx = NULL;
153 if (!share_info_db_init()) {
157 mem_ctx = talloc_init("set_share_security");
161 prs_init(&ps, (uint32)sec_desc_size(psd), mem_ctx, MARSHALL);
163 if (!sec_io_desc("share_security", &psd, &ps, 1))
166 slprintf(key, sizeof(key)-1, "SECDESC/%s", share_name);
168 if (tdb_prs_store(share_tdb, key, &ps)==0) {
170 DEBUG(5,("set_share_security: stored secdesc for %s\n", share_name ));
172 DEBUG(1,("set_share_security: Failed to store secdesc for %s\n", share_name ));
175 /* Free malloc'ed memory */
181 talloc_destroy(mem_ctx);
185 /*******************************************************************
186 Delete a security descriptor.
187 ********************************************************************/
189 BOOL delete_share_security(int snum)
194 slprintf(key, sizeof(key)-1, "SECDESC/%s", lp_servicename(snum));
196 kbuf.dsize = strlen(key)+1;
198 if (tdb_delete(share_tdb, kbuf) != 0) {
199 DEBUG(0,("delete_share_security: Failed to delete entry for share %s\n",
200 lp_servicename(snum) ));
207 /***************************************************************************
208 Parse the contents of an acl string from a usershare file.
209 ***************************************************************************/
211 BOOL parse_usershare_acl(TALLOC_CTX *ctx, const char *acl_str, SEC_DESC **ppsd)
214 const char *pacl = acl_str;
216 SEC_ACE *ace_list = NULL;
218 SEC_DESC *psd = NULL;
224 /* If the acl string is blank return "Everyone:R" */
226 SEC_DESC *default_psd = get_share_security_default(ctx, &s_size, GENERIC_READ_ACCESS);
236 /* Add the number of ',' characters to get the number of aces. */
237 num_aces += count_chars(pacl,',');
239 ace_list = TALLOC_ARRAY(ctx, SEC_ACE, num_aces);
244 for (i = 0; i < num_aces; i++) {
250 uint8 type = SEC_ACE_TYPE_ACCESS_ALLOWED;
252 if (!next_token(&pacl, sidstr, ":", sizeof(sidstr))) {
253 DEBUG(0,("parse_usershare_acl: malformed usershare acl looking "
254 "for ':' in string '%s'\n", pacl));
258 if (!string_to_sid(&sid, sidstr)) {
259 DEBUG(0,("parse_usershare_acl: failed to convert %s to sid.\n",
265 case 'F': /* Full Control, ie. R+W */
266 case 'f': /* Full Control, ie. R+W */
267 s_access = g_access = GENERIC_ALL_ACCESS;
269 case 'R': /* Read only. */
270 case 'r': /* Read only. */
271 s_access = g_access = GENERIC_READ_ACCESS;
273 case 'D': /* Deny all to this SID. */
274 case 'd': /* Deny all to this SID. */
275 type = SEC_ACE_TYPE_ACCESS_DENIED;
276 s_access = g_access = GENERIC_ALL_ACCESS;
279 DEBUG(0,("parse_usershare_acl: unknown acl type at %s.\n",
285 if (*pacl && *pacl != ',') {
286 DEBUG(0,("parse_usershare_acl: bad acl string at %s.\n",
290 pacl++; /* Go past any ',' */
292 se_map_generic(&s_access, &file_generic_mapping);
293 init_sec_access(&sa, g_access | s_access );
294 init_sec_ace(&ace_list[i], &sid, type, sa, 0);
297 if ((psa = make_sec_acl(ctx, NT4_ACL_REVISION, num_aces, ace_list)) != NULL) {
298 psd = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL, psa, &sd_size);
302 DEBUG(0,("parse_usershare_acl: Failed to make SEC_DESC.\n"));