s3-auth: rpc_server needs auth.h
[kai/samba.git] / source3 / rpc_server / rpc_handles.c
1 /* 
2  *  Unix SMB/CIFS implementation.
3  *  RPC Pipe client / server routines
4  *  Copyright (C) Andrew Tridgell              1992-1997,
5  *  Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
6  *  Copyright (C) Jeremy Allison                           2001.
7  *  
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 3 of the License, or
11  *  (at your option) any later version.
12  *  
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *  
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
20  */
21
22 #include "includes.h"
23 #include "../librpc/gen_ndr/ndr_lsa.h"
24 #include "../librpc/gen_ndr/ndr_samr.h"
25 #include "auth.h"
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_RPC_SRV
29
30 /*
31  * Handle database - stored per pipe.
32  */
33
34 struct dcesrv_handle {
35         struct dcesrv_handle *prev, *next;
36         struct policy_handle wire_handle;
37         uint32_t access_granted;
38         void *data;
39 };
40
41 struct handle_list {
42         struct dcesrv_handle *handles;  /* List of pipe handles. */
43         size_t count;                   /* Current number of handles. */
44         size_t pipe_ref_count;          /* Number of pipe handles referring
45                                          * to this tree. */
46 };
47
48 /* This is the max handles across all instances of a pipe name. */
49 #ifndef MAX_OPEN_POLS
50 #define MAX_OPEN_POLS 2048
51 #endif
52
53 /****************************************************************************
54  Hack as handles need to be persisant over lsa pipe closes so long as a samr
55  pipe is open. JRA.
56 ****************************************************************************/
57
58 static bool is_samr_lsa_pipe(const struct ndr_syntax_id *syntax)
59 {
60         return (ndr_syntax_id_equal(syntax, &ndr_table_samr.syntax_id)
61                 || ndr_syntax_id_equal(syntax, &ndr_table_lsarpc.syntax_id));
62 }
63
64 size_t num_pipe_handles(struct pipes_struct *p)
65 {
66         if (p->pipe_handles == NULL) {
67                 return 0;
68         }
69         return p->pipe_handles->count;
70 }
71
72 /****************************************************************************
73  Initialise a policy handle list on a pipe. Handle list is shared between all
74  pipes of the same name.
75 ****************************************************************************/
76
77 bool init_pipe_handles(struct pipes_struct *p, const struct ndr_syntax_id *syntax)
78 {
79         struct pipes_struct *plist;
80         struct handle_list *hl;
81
82         for (plist = get_first_internal_pipe();
83              plist;
84              plist = get_next_internal_pipe(plist)) {
85                 if (ndr_syntax_id_equal(syntax, &plist->syntax)) {
86                         break;
87                 }
88                 if (is_samr_lsa_pipe(&plist->syntax)
89                     && is_samr_lsa_pipe(syntax)) {
90                         /*
91                          * samr and lsa share a handle space (same process
92                          * under Windows?)
93                          */
94                         break;
95                 }
96         }
97
98         if (plist != NULL) {
99                 hl = plist->pipe_handles;
100                 if (hl == NULL) {
101                         return false;
102                 }
103         } else {
104                 /*
105                  * First open, we have to create the handle list
106                  */
107                 hl = talloc_zero(NULL, struct handle_list);
108                 if (hl == NULL) {
109                         return false;
110                 }
111
112                 DEBUG(10,("init_pipe_handle_list: created handle list for "
113                           "pipe %s\n",
114                           get_pipe_name_from_syntax(talloc_tos(), syntax)));
115         }
116
117         /*
118          * One more pipe is using this list.
119          */
120
121         hl->pipe_ref_count++;
122
123         /*
124          * Point this pipe at this list.
125          */
126
127         p->pipe_handles = hl;
128
129         DEBUG(10,("init_pipe_handle_list: pipe_handles ref count = %lu for "
130                   "pipe %s\n", (unsigned long)p->pipe_handles->pipe_ref_count,
131                   get_pipe_name_from_syntax(talloc_tos(), syntax)));
132
133         return True;
134 }
135
136 /****************************************************************************
137   find first available policy slot.  creates a policy handle for you.
138
139   If "data_ptr" is given, this must be a talloc'ed object, create_policy_hnd
140   talloc_moves this into the handle. If the policy_hnd is closed,
141   data_ptr is TALLOC_FREE()'ed
142 ****************************************************************************/
143
144 static struct dcesrv_handle *create_rpc_handle_internal(struct pipes_struct *p,
145                                 struct policy_handle *hnd, void *data_ptr)
146 {
147         struct dcesrv_handle *rpc_hnd;
148         static uint32 pol_hnd_low  = 0;
149         static uint32 pol_hnd_high = 0;
150         time_t t = time(NULL);
151
152         if (p->pipe_handles->count > MAX_OPEN_POLS) {
153                 DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
154                                 (int)p->pipe_handles->count));
155                 return NULL;
156         }
157
158         rpc_hnd = talloc_zero(p->pipe_handles, struct dcesrv_handle);
159         if (!rpc_hnd) {
160                 DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
161                 return NULL;
162         }
163
164         if (data_ptr != NULL) {
165                 rpc_hnd->data = talloc_move(rpc_hnd, &data_ptr);
166         }
167
168         pol_hnd_low++;
169         if (pol_hnd_low == 0) {
170                 pol_hnd_high++;
171         }
172
173         /* first bit must be null */
174         SIVAL(&rpc_hnd->wire_handle.handle_type, 0 , 0);
175
176         /* second bit is incrementing */
177         SIVAL(&rpc_hnd->wire_handle.uuid.time_low, 0 , pol_hnd_low);
178         SSVAL(&rpc_hnd->wire_handle.uuid.time_mid, 0 , pol_hnd_high);
179         SSVAL(&rpc_hnd->wire_handle.uuid.time_hi_and_version, 0, (pol_hnd_high >> 16));
180
181         /* split the current time into two 16 bit values */
182
183         /* something random */
184         SSVAL(rpc_hnd->wire_handle.uuid.clock_seq, 0, (t >> 16));
185         /* something random */
186         SSVAL(rpc_hnd->wire_handle.uuid.node, 0, t);
187         /* something more random */
188         SIVAL(rpc_hnd->wire_handle.uuid.node, 2, sys_getpid());
189
190         DLIST_ADD(p->pipe_handles->handles, rpc_hnd);
191         p->pipe_handles->count++;
192
193         *hnd = rpc_hnd->wire_handle;
194
195         DEBUG(4, ("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
196         dump_data(4, (uint8_t *)hnd, sizeof(*hnd));
197
198         return rpc_hnd;
199 }
200
201 bool create_policy_hnd(struct pipes_struct *p, struct policy_handle *hnd,
202                        void *data_ptr)
203 {
204         struct dcesrv_handle *rpc_hnd;
205
206         rpc_hnd = create_rpc_handle_internal(p, hnd, data_ptr);
207         if (rpc_hnd == NULL) {
208                 return false;
209         }
210         return true;
211 }
212
213 /****************************************************************************
214   find policy by handle - internal version.
215 ****************************************************************************/
216
217 static struct dcesrv_handle *find_policy_by_hnd_internal(struct pipes_struct *p,
218                                 const struct policy_handle *hnd, void **data_p)
219 {
220         struct dcesrv_handle *h;
221         unsigned int count;
222
223         if (data_p) {
224                 *data_p = NULL;
225         }
226
227         count = 0;
228         for (h = p->pipe_handles->handles; h != NULL; h = h->next) {
229                 if (memcmp(&h->wire_handle, hnd, sizeof(*hnd)) == 0) {
230                         DEBUG(4,("Found policy hnd[%u] ", count));
231                         dump_data(4, (uint8 *)hnd, sizeof(*hnd));
232                         if (data_p) {
233                                 *data_p = h->data;
234                         }
235                         return h;
236                 }
237                 count++;
238         }
239
240         DEBUG(4,("Policy not found: "));
241         dump_data(4, (uint8_t *)hnd, sizeof(*hnd));
242
243         p->bad_handle_fault_state = true;
244
245         return NULL;
246 }
247
248 /****************************************************************************
249   find policy by handle
250 ****************************************************************************/
251
252 bool find_policy_by_hnd(struct pipes_struct *p, const struct policy_handle *hnd,
253                         void **data_p)
254 {
255         struct dcesrv_handle *rpc_hnd;
256
257         rpc_hnd = find_policy_by_hnd_internal(p, hnd, data_p);
258         if (rpc_hnd == NULL) {
259                 return false;
260         }
261         return true;
262 }
263
264 /****************************************************************************
265   Close a policy.
266 ****************************************************************************/
267
268 bool close_policy_hnd(struct pipes_struct *p, struct policy_handle *hnd)
269 {
270         struct dcesrv_handle *rpc_hnd;
271
272         rpc_hnd = find_policy_by_hnd_internal(p, hnd, NULL);
273
274         if (rpc_hnd == NULL) {
275                 DEBUG(3, ("Error closing policy (policy not found)\n"));
276                 return false;
277         }
278
279         DEBUG(3,("Closed policy\n"));
280
281         p->pipe_handles->count--;
282
283         DLIST_REMOVE(p->pipe_handles->handles, rpc_hnd);
284         TALLOC_FREE(rpc_hnd);
285
286         return true;
287 }
288
289 /****************************************************************************
290  Close a pipe - free the handle set if it was the last pipe reference.
291 ****************************************************************************/
292
293 void close_policy_by_pipe(struct pipes_struct *p)
294 {
295         p->pipe_handles->pipe_ref_count--;
296
297         if (p->pipe_handles->pipe_ref_count == 0) {
298                 /*
299                  * Last pipe open on this list - free the list.
300                  */
301                 TALLOC_FREE(p->pipe_handles);
302
303                 DEBUG(10,("close_policy_by_pipe: deleted handle list for "
304                           "pipe %s\n",
305                           get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
306         }
307 }
308
309 /*******************************************************************
310 Shall we allow access to this rpc?  Currently this function
311 implements the 'restrict anonymous' setting by denying access to
312 anonymous users if the restrict anonymous level is > 0.  Further work
313 will be checking a security descriptor to determine whether a user
314 token has enough access to access the pipe.
315 ********************************************************************/
316
317 bool pipe_access_check(struct pipes_struct *p)
318 {
319         /* Don't let anonymous users access this RPC if restrict
320            anonymous > 0 */
321
322         if (lp_restrict_anonymous() > 0) {
323
324                 /* schannel, so we must be ok */
325                 if (p->pipe_bound &&
326                     (p->auth.auth_type == DCERPC_AUTH_TYPE_SCHANNEL)) {
327                         return True;
328                 }
329
330                 if (p->session_info->guest) {
331                         return False;
332                 }
333         }
334
335         return True;
336 }
337
338 void *_policy_handle_create(struct pipes_struct *p, struct policy_handle *hnd,
339                             uint32_t access_granted, size_t data_size,
340                             const char *type, NTSTATUS *pstatus)
341 {
342         struct dcesrv_handle *rpc_hnd;
343         void *data;
344
345         if (p->pipe_handles->count > MAX_OPEN_POLS) {
346                 DEBUG(0, ("policy_handle_create: ERROR: too many handles (%d) "
347                           "on pipe %s.\n", (int)p->pipe_handles->count,
348                           get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
349                 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
350                 return NULL;
351         }
352
353         data = talloc_size(talloc_tos(), data_size);
354         if (data == NULL) {
355                 *pstatus = NT_STATUS_NO_MEMORY;
356                 return NULL;
357         }
358         talloc_set_name_const(data, type);
359
360         rpc_hnd = create_rpc_handle_internal(p, hnd, data);
361         if (rpc_hnd == NULL) {
362                 TALLOC_FREE(data);
363                 *pstatus = NT_STATUS_NO_MEMORY;
364                 return NULL;
365         }
366         rpc_hnd->access_granted = access_granted;
367         *pstatus = NT_STATUS_OK;
368         return data;
369 }
370
371 void *_policy_handle_find(struct pipes_struct *p,
372                           const struct policy_handle *hnd,
373                           uint32_t access_required,
374                           uint32_t *paccess_granted,
375                           const char *name, const char *location,
376                           NTSTATUS *pstatus)
377 {
378         struct dcesrv_handle *rpc_hnd;
379         void *data;
380
381         rpc_hnd = find_policy_by_hnd_internal(p, hnd, &data);
382         if (rpc_hnd == NULL) {
383                 *pstatus = NT_STATUS_INVALID_HANDLE;
384                 return NULL;
385         }
386         if (strcmp(name, talloc_get_name(data)) != 0) {
387                 DEBUG(10, ("expected %s, got %s\n", name,
388                            talloc_get_name(data)));
389                 *pstatus = NT_STATUS_INVALID_HANDLE;
390                 return NULL;
391         }
392         if ((access_required & rpc_hnd->access_granted) != access_required) {
393                 if (geteuid() == sec_initial_uid()) {
394                         DEBUG(4, ("%s: ACCESS should be DENIED (granted: "
395                                   "%#010x; required: %#010x)\n", location,
396                                   rpc_hnd->access_granted, access_required));
397                         DEBUGADD(4,("but overwritten by euid == 0\n"));
398                         goto okay;
399                 }
400                 DEBUG(2,("%s: ACCESS DENIED (granted: %#010x; required: "
401                          "%#010x)\n", location, rpc_hnd->access_granted,
402                          access_required));
403                 *pstatus = NT_STATUS_ACCESS_DENIED;
404                 return NULL;
405         }
406
407  okay:
408         DEBUG(10, ("found handle of type %s\n", talloc_get_name(data)));
409         if (paccess_granted != NULL) {
410                 *paccess_granted = rpc_hnd->access_granted;
411         }
412         *pstatus = NT_STATUS_OK;
413         return data;
414 }