Line data Source code
1 : /*
2 : ACL utility functions
3 :
4 : Copyright (C) Nadezhda Ivanova 2010
5 :
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.
10 :
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.
15 :
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/>.
18 : */
19 :
20 : /*
21 : * Name: acl_util
22 : *
23 : * Component: ldb ACL modules
24 : *
25 : * Description: Some auxiliary functions used for access checking
26 : *
27 : * Author: Nadezhda Ivanova
28 : */
29 : #include "includes.h"
30 : #include "ldb_module.h"
31 : #include "auth/auth.h"
32 : #include "libcli/security/security.h"
33 : #include "dsdb/samdb/samdb.h"
34 : #include "librpc/gen_ndr/ndr_security.h"
35 : #include "param/param.h"
36 : #include "dsdb/samdb/ldb_modules/util.h"
37 :
38 5131789 : struct security_token *acl_user_token(struct ldb_module *module)
39 : {
40 5131789 : struct ldb_context *ldb = ldb_module_get_ctx(module);
41 4569612 : struct auth_session_info *session_info
42 562177 : = (struct auth_session_info *)ldb_get_opaque(
43 : ldb,
44 : DSDB_SESSION_INFO);
45 5131789 : if(!session_info) {
46 0 : return NULL;
47 : }
48 5131781 : return session_info->security_token;
49 : }
50 :
51 : /* performs an access check from inside the module stack
52 : * given the dn of the object to be checked, the required access
53 : * guid is either the guid of the extended right, or NULL
54 : */
55 :
56 1255333 : int dsdb_module_check_access_on_dn(struct ldb_module *module,
57 : TALLOC_CTX *mem_ctx,
58 : struct ldb_dn *dn,
59 : uint32_t access_mask,
60 : const struct GUID *guid,
61 : struct ldb_request *parent)
62 : {
63 : int ret;
64 : struct ldb_result *acl_res;
65 : static const char *acl_attrs[] = {
66 : "nTSecurityDescriptor",
67 : "objectSid",
68 : NULL
69 : };
70 1255333 : struct ldb_context *ldb = ldb_module_get_ctx(module);
71 1025957 : struct auth_session_info *session_info
72 229376 : = (struct auth_session_info *)ldb_get_opaque(
73 : ldb,
74 : DSDB_SESSION_INFO);
75 1255333 : if(!session_info) {
76 0 : return ldb_operr(ldb);
77 : }
78 1255333 : ret = dsdb_module_search_dn(module, mem_ctx, &acl_res, dn,
79 : acl_attrs,
80 : DSDB_FLAG_NEXT_MODULE |
81 : DSDB_FLAG_AS_SYSTEM |
82 : DSDB_SEARCH_SHOW_RECYCLED,
83 : parent);
84 1255333 : if (ret != LDB_SUCCESS) {
85 363 : ldb_asprintf_errstring(ldb_module_get_ctx(module),
86 : "access_check: failed to find object %s\n",
87 : ldb_dn_get_linearized(dn));
88 363 : return ret;
89 : }
90 1254970 : return dsdb_check_access_on_dn_internal(ldb, acl_res,
91 : mem_ctx,
92 : session_info->security_token,
93 : dn,
94 : access_mask,
95 : guid);
96 : }
97 :
98 4640531 : int acl_check_access_on_attribute(struct ldb_module *module,
99 : TALLOC_CTX *mem_ctx,
100 : struct security_descriptor *sd,
101 : struct dom_sid *rp_sid,
102 : uint32_t access_mask,
103 : const struct dsdb_attribute *attr,
104 : const struct dsdb_class *objectclass)
105 : {
106 : int ret;
107 : NTSTATUS status;
108 : uint32_t access_granted;
109 4640531 : struct object_tree *root = NULL;
110 4640531 : struct object_tree *new_node = NULL;
111 4640531 : TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
112 4640531 : struct security_token *token = acl_user_token(module);
113 :
114 4640531 : if (!insert_in_object_tree(tmp_ctx,
115 : &objectclass->schemaIDGUID,
116 : access_mask, NULL,
117 : &root)) {
118 0 : DEBUG(10, ("acl_search: cannot add to object tree class schemaIDGUID\n"));
119 0 : goto fail;
120 : }
121 4640531 : new_node = root;
122 :
123 4640531 : if (!GUID_all_zero(&attr->attributeSecurityGUID)) {
124 3334417 : if (!insert_in_object_tree(tmp_ctx,
125 : &attr->attributeSecurityGUID,
126 : access_mask, new_node,
127 : &new_node)) {
128 0 : DEBUG(10, ("acl_search: cannot add to object tree securityGUID\n"));
129 0 : goto fail;
130 : }
131 : }
132 :
133 4640531 : if (!insert_in_object_tree(tmp_ctx,
134 : &attr->schemaIDGUID,
135 : access_mask, new_node,
136 : &new_node)) {
137 0 : DEBUG(10, ("acl_search: cannot add to object tree attributeGUID\n"));
138 0 : goto fail;
139 : }
140 :
141 4640531 : status = sec_access_check_ds(sd, token,
142 : access_mask,
143 : &access_granted,
144 : root,
145 : rp_sid);
146 4640531 : if (!NT_STATUS_IS_OK(status)) {
147 37675 : ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
148 : }
149 : else {
150 4602856 : ret = LDB_SUCCESS;
151 : }
152 4640531 : talloc_free(tmp_ctx);
153 4640531 : return ret;
154 0 : fail:
155 0 : talloc_free(tmp_ctx);
156 0 : return ldb_operr(ldb_module_get_ctx(module));
157 : }
158 :
159 28243 : int acl_check_access_on_objectclass(struct ldb_module *module,
160 : TALLOC_CTX *mem_ctx,
161 : struct security_descriptor *sd,
162 : struct dom_sid *rp_sid,
163 : uint32_t access_mask,
164 : const struct dsdb_class *objectclass)
165 : {
166 : int ret;
167 : NTSTATUS status;
168 : uint32_t access_granted;
169 28243 : struct object_tree *root = NULL;
170 28243 : TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
171 28243 : struct security_token *token = acl_user_token(module);
172 :
173 28243 : if (!insert_in_object_tree(tmp_ctx,
174 : &objectclass->schemaIDGUID,
175 : access_mask, NULL,
176 : &root)) {
177 0 : DEBUG(10, ("acl_search: cannot add to object tree class schemaIDGUID\n"));
178 0 : goto fail;
179 : }
180 :
181 28243 : status = sec_access_check_ds(sd, token,
182 : access_mask,
183 : &access_granted,
184 : root,
185 : rp_sid);
186 28243 : if (!NT_STATUS_IS_OK(status)) {
187 1883 : ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
188 : } else {
189 26360 : ret = LDB_SUCCESS;
190 : }
191 28243 : talloc_free(tmp_ctx);
192 28243 : return ret;
193 0 : fail:
194 0 : talloc_free(tmp_ctx);
195 0 : return ldb_operr(ldb_module_get_ctx(module));
196 : }
197 :
198 : /* checks for validated writes */
199 14624 : int acl_check_extended_right(TALLOC_CTX *mem_ctx,
200 : struct security_descriptor *sd,
201 : struct security_token *token,
202 : const char *ext_right,
203 : uint32_t right_type,
204 : struct dom_sid *sid)
205 : {
206 : struct GUID right;
207 : NTSTATUS status;
208 : uint32_t access_granted;
209 14624 : struct object_tree *root = NULL;
210 14624 : TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
211 :
212 14624 : GUID_from_string(ext_right, &right);
213 :
214 14624 : if (!insert_in_object_tree(tmp_ctx, &right, right_type,
215 : NULL, &root)) {
216 0 : DEBUG(10, ("acl_ext_right: cannot add to object tree\n"));
217 0 : talloc_free(tmp_ctx);
218 0 : return LDB_ERR_OPERATIONS_ERROR;
219 : }
220 14624 : status = sec_access_check_ds(sd, token,
221 : right_type,
222 : &access_granted,
223 : root,
224 : sid);
225 :
226 14624 : if (!NT_STATUS_IS_OK(status)) {
227 183 : talloc_free(tmp_ctx);
228 183 : return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
229 : }
230 14441 : talloc_free(tmp_ctx);
231 14441 : return LDB_SUCCESS;
232 : }
233 :
234 0 : const char *acl_user_name(TALLOC_CTX *mem_ctx, struct ldb_module *module)
235 : {
236 0 : struct ldb_context *ldb = ldb_module_get_ctx(module);
237 0 : struct auth_session_info *session_info
238 0 : = (struct auth_session_info *)ldb_get_opaque(
239 : ldb,
240 : DSDB_SESSION_INFO);
241 0 : if (!session_info) {
242 0 : return "UNKNOWN (NULL)";
243 : }
244 :
245 0 : return talloc_asprintf(mem_ctx, "%s\\%s",
246 0 : session_info->info->domain_name,
247 0 : session_info->info->account_name);
248 : }
249 :
250 21088009 : uint32_t dsdb_request_sd_flags(struct ldb_request *req, bool *explicit)
251 : {
252 : struct ldb_control *sd_control;
253 21088009 : uint32_t sd_flags = 0;
254 :
255 21088009 : if (explicit) {
256 20575176 : *explicit = false;
257 : }
258 :
259 21088009 : sd_control = ldb_request_get_control(req, LDB_CONTROL_SD_FLAGS_OID);
260 21088009 : if (sd_control != NULL && sd_control->data != NULL) {
261 1147761 : struct ldb_sd_flags_control *sdctr = (struct ldb_sd_flags_control *)sd_control->data;
262 :
263 1147761 : sd_flags = sdctr->secinfo_flags;
264 :
265 1147761 : if (explicit) {
266 1127122 : *explicit = true;
267 : }
268 :
269 : /* mark it as handled */
270 1147761 : sd_control->critical = 0;
271 : }
272 :
273 : /* we only care for the last 4 bits */
274 21088009 : sd_flags &= 0x0000000F;
275 :
276 : /*
277 : * MS-ADTS 3.1.1.3.4.1.11 says that no bits
278 : * equals all 4 bits
279 : */
280 21088009 : if (sd_flags == 0) {
281 19940302 : sd_flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL | SECINFO_SACL;
282 : }
283 :
284 21088009 : return sd_flags;
285 : }
286 :
287 330431 : int dsdb_module_schedule_sd_propagation(struct ldb_module *module,
288 : struct ldb_dn *nc_root,
289 : struct GUID guid,
290 : bool include_self)
291 : {
292 330431 : struct ldb_context *ldb = ldb_module_get_ctx(module);
293 : struct dsdb_extended_sec_desc_propagation_op *op;
294 : int ret;
295 :
296 330431 : op = talloc_zero(module, struct dsdb_extended_sec_desc_propagation_op);
297 330431 : if (op == NULL) {
298 0 : return ldb_oom(ldb);
299 : }
300 :
301 330431 : op->nc_root = nc_root;
302 330431 : op->guid = guid;
303 330431 : op->include_self = include_self;
304 :
305 330431 : ret = dsdb_module_extended(module, op, NULL,
306 : DSDB_EXTENDED_SEC_DESC_PROPAGATION_OID,
307 : op,
308 : DSDB_FLAG_TOP_MODULE |
309 : DSDB_FLAG_AS_SYSTEM |
310 : DSDB_FLAG_TRUSTED,
311 : NULL);
312 330431 : TALLOC_FREE(op);
313 330431 : return ret;
314 : }
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