s4:rpc_server/lsa: implement the policy security descriptor
[kai/samba-autobuild/.git] / source4 / rpc_server / lsa / lsa_init.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    endpoint server for the lsarpc pipe
5
6    Copyright (C) Andrew Tridgell 2004
7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2007
8    
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 3 of the License, or
12    (at your option) any later version.
13    
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18    
19    You should have received a copy of the GNU General Public License
20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "rpc_server/lsa/lsa.h"
24
25 /*
26  * This matches a Windows 2012R2 dc in
27  * a domain with function level 2012R2.
28  */
29 #define DCESRV_LSA_POLICY_SD_SDDL \
30         "O:BAG:SY" \
31         "D:" \
32         "(D;;0x00000800;;;AN)" \
33         "(A;;GA;;;BA)" \
34         "(A;;GX;;;WD)" \
35         "(A;;0x00000801;;;AN)" \
36         "(A;;0x00001000;;;LS)" \
37         "(A;;0x00001000;;;NS)" \
38         "(A;;0x00001000;;;IS)" \
39         "(A;;0x00000801;;;S-1-15-2-1)"
40
41 static const struct generic_mapping dcesrv_lsa_policy_mapping = {
42         LSA_POLICY_READ,
43         LSA_POLICY_WRITE,
44         LSA_POLICY_EXECUTE,
45         LSA_POLICY_ALL_ACCESS
46 };
47
48 NTSTATUS dcesrv_lsa_get_policy_state(struct dcesrv_call_state *dce_call,
49                                      TALLOC_CTX *mem_ctx,
50                                      uint32_t access_desired,
51                                      struct lsa_policy_state **_state)
52 {
53         struct auth_session_info *session_info = dce_call->conn->auth_state.session_info;
54         enum security_user_level security_level;
55         struct lsa_policy_state *state;
56         struct ldb_result *dom_res;
57         const char *dom_attrs[] = {
58                 "objectSid", 
59                 "objectGUID", 
60                 "nTMixedDomain",
61                 "fSMORoleOwner",
62                 NULL
63         };
64         char *p;
65         int ret;
66
67         state = talloc_zero(mem_ctx, struct lsa_policy_state);
68         if (!state) {
69                 return NT_STATUS_NO_MEMORY;
70         }
71
72         /* make sure the sam database is accessible */
73         state->sam_ldb = samdb_connect(state, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx, dce_call->conn->auth_state.session_info, 0);
74         if (state->sam_ldb == NULL) {
75                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
76         }
77
78         /* and the privilege database */
79         state->pdb = privilege_connect(state, dce_call->conn->dce_ctx->lp_ctx);
80         if (state->pdb == NULL) {
81                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
82         }
83
84         /* work out the domain_dn - useful for so many calls its worth
85            fetching here */
86         state->domain_dn = ldb_get_default_basedn(state->sam_ldb);
87         if (!state->domain_dn) {
88                 return NT_STATUS_NO_MEMORY;             
89         }
90
91         /* work out the forest root_dn - useful for so many calls its worth
92            fetching here */
93         state->forest_dn = ldb_get_root_basedn(state->sam_ldb);
94         if (!state->forest_dn) {
95                 return NT_STATUS_NO_MEMORY;             
96         }
97
98         ret = ldb_search(state->sam_ldb, mem_ctx, &dom_res,
99                          state->domain_dn, LDB_SCOPE_BASE, dom_attrs, NULL);
100         if (ret != LDB_SUCCESS) {
101                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
102         }
103         if (dom_res->count != 1) {
104                 return NT_STATUS_NO_SUCH_DOMAIN;                
105         }
106
107         state->domain_sid = samdb_result_dom_sid(state, dom_res->msgs[0], "objectSid");
108         if (!state->domain_sid) {
109                 return NT_STATUS_NO_SUCH_DOMAIN;                
110         }
111
112         state->domain_guid = samdb_result_guid(dom_res->msgs[0], "objectGUID");
113
114         state->mixed_domain = ldb_msg_find_attr_as_uint(dom_res->msgs[0], "nTMixedDomain", 0);
115         
116         talloc_free(dom_res);
117
118         state->domain_name = lpcfg_sam_name(dce_call->conn->dce_ctx->lp_ctx);
119
120         state->domain_dns = ldb_dn_canonical_string(state, state->domain_dn);
121         if (!state->domain_dns) {
122                 return NT_STATUS_NO_SUCH_DOMAIN;                
123         }
124         p = strchr(state->domain_dns, '/');
125         if (p) {
126                 *p = '\0';
127         }
128
129         state->forest_dns = ldb_dn_canonical_string(state, state->forest_dn);
130         if (!state->forest_dns) {
131                 return NT_STATUS_NO_SUCH_DOMAIN;                
132         }
133         p = strchr(state->forest_dns, '/');
134         if (p) {
135                 *p = '\0';
136         }
137
138         /* work out the builtin_dn - useful for so many calls its worth
139            fetching here */
140         state->builtin_dn = samdb_search_dn(state->sam_ldb, state, state->domain_dn, "(objectClass=builtinDomain)");
141         if (!state->builtin_dn) {
142                 return NT_STATUS_NO_SUCH_DOMAIN;                
143         }
144
145         /* work out the system_dn - useful for so many calls its worth
146            fetching here */
147         state->system_dn = samdb_search_dn(state->sam_ldb, state,
148                                            state->domain_dn, "(&(objectClass=container)(cn=System))");
149         if (!state->system_dn) {
150                 return NT_STATUS_NO_SUCH_DOMAIN;                
151         }
152
153         state->builtin_sid = dom_sid_parse_talloc(state, SID_BUILTIN);
154         if (!state->builtin_sid) {
155                 return NT_STATUS_NO_SUCH_DOMAIN;                
156         }
157
158         state->nt_authority_sid = dom_sid_parse_talloc(state, SID_NT_AUTHORITY);
159         if (!state->nt_authority_sid) {
160                 return NT_STATUS_NO_SUCH_DOMAIN;                
161         }
162
163         state->creator_owner_domain_sid = dom_sid_parse_talloc(state, SID_CREATOR_OWNER_DOMAIN);
164         if (!state->creator_owner_domain_sid) {
165                 return NT_STATUS_NO_SUCH_DOMAIN;                
166         }
167
168         state->world_domain_sid = dom_sid_parse_talloc(state, SID_WORLD_DOMAIN);
169         if (!state->world_domain_sid) {
170                 return NT_STATUS_NO_SUCH_DOMAIN;                
171         }
172
173         state->sd = sddl_decode(state, DCESRV_LSA_POLICY_SD_SDDL,
174                                 state->domain_sid);
175         if (state->sd == NULL) {
176                 return NT_STATUS_NO_MEMORY;
177         }
178         state->sd->dacl->revision = SECURITY_ACL_REVISION_NT4;
179
180         se_map_generic(&access_desired, &dcesrv_lsa_policy_mapping);
181         security_acl_map_generic(state->sd->dacl, &dcesrv_lsa_policy_mapping);
182
183         security_level = security_session_user_level(session_info, NULL);
184         if (security_level >= SECURITY_SYSTEM) {
185                 /*
186                  * The security descriptor doesn't allow system,
187                  * but we want to allow system via ncalrpc as root.
188                  */
189                 state->access_mask = access_desired;
190                 if (state->access_mask & SEC_FLAG_MAXIMUM_ALLOWED) {
191                         state->access_mask &= ~SEC_FLAG_MAXIMUM_ALLOWED;
192                         state->access_mask |= LSA_POLICY_ALL_ACCESS;
193                 }
194         } else {
195                 NTSTATUS status;
196
197                 status = se_access_check(state->sd,
198                                          session_info->security_token,
199                                          access_desired,
200                                          &state->access_mask);
201                 if (!NT_STATUS_IS_OK(status)) {
202                         DEBUG(2,("%s: access desired[0x%08X] rejected[0x%08X] - %s\n",
203                                  __func__,
204                                  (unsigned)access_desired,
205                                  (unsigned)state->access_mask,
206                                  nt_errstr(status)));
207                         return status;
208                 }
209         }
210
211         DEBUG(10,("%s: access desired[0x%08X] granted[0x%08X] - success.\n",
212                   __func__,
213                  (unsigned)access_desired,
214                  (unsigned)state->access_mask));
215
216         *_state = state;
217
218         return NT_STATUS_OK;
219 }
220
221 /* 
222   lsa_OpenPolicy2
223 */
224 NTSTATUS dcesrv_lsa_OpenPolicy2(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
225                                 struct lsa_OpenPolicy2 *r)
226 {
227         enum dcerpc_transport_t transport =
228                 dcerpc_binding_get_transport(dce_call->conn->endpoint->ep_description);
229         NTSTATUS status;
230         struct lsa_policy_state *state;
231         struct dcesrv_handle *handle;
232
233         if (transport != NCACN_NP && transport != NCALRPC) {
234                 DCESRV_FAULT(DCERPC_FAULT_ACCESS_DENIED);
235         }
236
237         ZERO_STRUCTP(r->out.handle);
238
239         if (r->in.attr != NULL &&
240             r->in.attr->root_dir != NULL) {
241                 /* MS-LSAD 3.1.4.4.1 */
242                 return NT_STATUS_INVALID_PARAMETER;
243         }
244
245         status = dcesrv_lsa_get_policy_state(dce_call, mem_ctx,
246                                              r->in.access_mask,
247                                              &state);
248         if (!NT_STATUS_IS_OK(status)) {
249                 return status;
250         }
251
252         handle = dcesrv_handle_new(dce_call->context, LSA_HANDLE_POLICY);
253         if (!handle) {
254                 return NT_STATUS_NO_MEMORY;
255         }
256
257         handle->data = talloc_steal(handle, state);
258
259         state->handle = handle;
260         *r->out.handle = handle->wire_handle;
261
262         /* note that we have completely ignored the attr element of
263            the OpenPolicy. As far as I can tell, this is what w2k3
264            does */
265
266         return NT_STATUS_OK;
267 }
268
269 /* 
270   lsa_OpenPolicy
271   a wrapper around lsa_OpenPolicy2
272 */
273 NTSTATUS dcesrv_lsa_OpenPolicy(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
274                                 struct lsa_OpenPolicy *r)
275 {
276         enum dcerpc_transport_t transport =
277                 dcerpc_binding_get_transport(dce_call->conn->endpoint->ep_description);
278         struct lsa_OpenPolicy2 r2;
279
280         if (transport != NCACN_NP && transport != NCALRPC) {
281                 DCESRV_FAULT(DCERPC_FAULT_ACCESS_DENIED);
282         }
283
284         r2.in.system_name = NULL;
285         r2.in.attr = r->in.attr;
286         r2.in.access_mask = r->in.access_mask;
287         r2.out.handle = r->out.handle;
288
289         return dcesrv_lsa_OpenPolicy2(dce_call, mem_ctx, &r2);
290 }
291
292