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DEFINITIONS
This source file includes following definitions.
- is_samr_lsa_pipe
- init_pipe_handle_list
- create_policy_hnd
- find_policy_by_hnd_internal
- find_policy_by_hnd
- close_policy_hnd
- close_policy_by_pipe
- pipe_access_check
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
24 #undef DBGC_CLASS
25 #define DBGC_CLASS DBGC_RPC_SRV
26
27 /* This is the max handles across all instances of a pipe name. */
28 #ifndef MAX_OPEN_POLS
29 #define MAX_OPEN_POLS 2048
30 #endif
31
32 /****************************************************************************
33 Hack as handles need to be persisant over lsa pipe closes so long as a samr
34 pipe is open. JRA.
35 ****************************************************************************/
36
37 static bool is_samr_lsa_pipe(const struct ndr_syntax_id *syntax)
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38 {
39 return (ndr_syntax_id_equal(syntax, &ndr_table_samr.syntax_id)
40 || ndr_syntax_id_equal(syntax, &ndr_table_lsarpc.syntax_id));
41 }
42
43 /****************************************************************************
44 Initialise a policy handle list on a pipe. Handle list is shared between all
45 pipes of the same name.
46 ****************************************************************************/
47
48 bool init_pipe_handle_list(pipes_struct *p, const struct ndr_syntax_id *syntax)
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49 {
50 pipes_struct *plist;
51 struct handle_list *hl;
52
53 for (plist = get_first_internal_pipe();
54 plist;
55 plist = get_next_internal_pipe(plist)) {
56 if (ndr_syntax_id_equal(syntax, &plist->syntax)) {
57 break;
58 }
59 if (is_samr_lsa_pipe(&plist->syntax)
60 && is_samr_lsa_pipe(syntax)) {
61 /*
62 * samr and lsa share a handle space (same process
63 * under Windows?)
64 */
65 break;
66 }
67 }
68
69 if (plist != NULL) {
70 hl = plist->pipe_handles;
71 if (hl == NULL) {
72 return false;
73 }
74 } else {
75 /*
76 * First open, we have to create the handle list
77 */
78 hl = SMB_MALLOC_P(struct handle_list);
79 if (hl == NULL) {
80 return false;
81 }
82 ZERO_STRUCTP(hl);
83
84 DEBUG(10,("init_pipe_handles: created handle list for "
85 "pipe %s\n", get_pipe_name_from_iface(syntax)));
86 }
87
88 /*
89 * One more pipe is using this list.
90 */
91
92 hl->pipe_ref_count++;
93
94 /*
95 * Point this pipe at this list.
96 */
97
98 p->pipe_handles = hl;
99
100 DEBUG(10,("init_pipe_handles: pipe_handles ref count = %lu for pipe %s\n",
101 (unsigned long)p->pipe_handles->pipe_ref_count,
102 get_pipe_name_from_iface(syntax)));
103
104 return True;
105 }
106
107 /****************************************************************************
108 find first available policy slot. creates a policy handle for you.
109
110 If "data_ptr" is given, this must be a talloc'ed object, create_policy_hnd
111 talloc_moves this into the handle. If the policy_hnd is closed,
112 data_ptr is TALLOC_FREE()'ed
113 ****************************************************************************/
114
115 bool create_policy_hnd(pipes_struct *p, struct policy_handle *hnd, void *data_ptr)
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116 {
117 static uint32 pol_hnd_low = 0;
118 static uint32 pol_hnd_high = 0;
119 time_t t = time(NULL);
120
121 struct policy *pol;
122
123 if (p->pipe_handles->count > MAX_OPEN_POLS) {
124 DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
125 (int)p->pipe_handles->count));
126 return False;
127 }
128
129 pol = TALLOC_ZERO_P(NULL, struct policy);
130 if (!pol) {
131 DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
132 return False;
133 }
134
135 if (data_ptr != NULL) {
136 pol->data_ptr = talloc_move(pol, &data_ptr);
137 }
138
139 pol_hnd_low++;
140 if (pol_hnd_low == 0)
141 (pol_hnd_high)++;
142
143 SIVAL(&pol->pol_hnd.handle_type, 0 , 0); /* first bit must be null */
144 SIVAL(&pol->pol_hnd.uuid.time_low, 0 , pol_hnd_low ); /* second bit is incrementing */
145 SSVAL(&pol->pol_hnd.uuid.time_mid, 0 , pol_hnd_high); /* second bit is incrementing */
146 SSVAL(&pol->pol_hnd.uuid.time_hi_and_version, 0 , (pol_hnd_high>>16)); /* second bit is incrementing */
147
148 /* split the current time into two 16 bit values */
149
150 SSVAL(pol->pol_hnd.uuid.clock_seq, 0, (t>>16)); /* something random */
151 SSVAL(pol->pol_hnd.uuid.node, 0, t); /* something random */
152
153 SIVAL(pol->pol_hnd.uuid.node, 2, sys_getpid()); /* something more random */
154
155 DLIST_ADD(p->pipe_handles->Policy, pol);
156 p->pipe_handles->count++;
157
158 *hnd = pol->pol_hnd;
159
160 DEBUG(4,("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
161 dump_data(4, (uint8 *)hnd, sizeof(*hnd));
162
163 return True;
164 }
165
166 /****************************************************************************
167 find policy by handle - internal version.
168 ****************************************************************************/
169
170 static struct policy *find_policy_by_hnd_internal(pipes_struct *p, struct policy_handle *hnd, void **data_p)
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171 {
172 struct policy *pol;
173 size_t i;
174
175 if (data_p)
176 *data_p = NULL;
177
178 for (i = 0, pol=p->pipe_handles->Policy;pol;pol=pol->next, i++) {
179 if (memcmp(&pol->pol_hnd, hnd, sizeof(*hnd)) == 0) {
180 DEBUG(4,("Found policy hnd[%d] ", (int)i));
181 dump_data(4, (uint8 *)hnd, sizeof(*hnd));
182 if (data_p)
183 *data_p = pol->data_ptr;
184 return pol;
185 }
186 }
187
188 DEBUG(4,("Policy not found: "));
189 dump_data(4, (uint8 *)hnd, sizeof(*hnd));
190
191 p->bad_handle_fault_state = True;
192
193 return NULL;
194 }
195
196 /****************************************************************************
197 find policy by handle
198 ****************************************************************************/
199
200 bool find_policy_by_hnd(pipes_struct *p, struct policy_handle *hnd, void **data_p)
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201 {
202 return find_policy_by_hnd_internal(p, hnd, data_p) == NULL ? False : True;
203 }
204
205 /****************************************************************************
206 Close a policy.
207 ****************************************************************************/
208
209 bool close_policy_hnd(pipes_struct *p, struct policy_handle *hnd)
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210 {
211 struct policy *pol = find_policy_by_hnd_internal(p, hnd, NULL);
212
213 if (!pol) {
214 DEBUG(3,("Error closing policy\n"));
215 return False;
216 }
217
218 DEBUG(3,("Closed policy\n"));
219
220 p->pipe_handles->count--;
221
222 DLIST_REMOVE(p->pipe_handles->Policy, pol);
223
224 TALLOC_FREE(pol);
225
226 return True;
227 }
228
229 /****************************************************************************
230 Close a pipe - free the handle list if it was the last pipe reference.
231 ****************************************************************************/
232
233 void close_policy_by_pipe(pipes_struct *p)
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234 {
235 p->pipe_handles->pipe_ref_count--;
236
237 if (p->pipe_handles->pipe_ref_count == 0) {
238 /*
239 * Last pipe open on this list - free the list.
240 */
241 while (p->pipe_handles->Policy)
242 close_policy_hnd(p, &p->pipe_handles->Policy->pol_hnd);
243
244 p->pipe_handles->Policy = NULL;
245 p->pipe_handles->count = 0;
246
247 SAFE_FREE(p->pipe_handles);
248 DEBUG(10,("close_policy_by_pipe: deleted handle list for "
249 "pipe %s\n", get_pipe_name_from_iface(&p->syntax)));
250 }
251 }
252
253 /*******************************************************************
254 Shall we allow access to this rpc? Currently this function
255 implements the 'restrict anonymous' setting by denying access to
256 anonymous users if the restrict anonymous level is > 0. Further work
257 will be checking a security descriptor to determine whether a user
258 token has enough access to access the pipe.
259 ********************************************************************/
260
261 bool pipe_access_check(pipes_struct *p)
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262 {
263 /* Don't let anonymous users access this RPC if restrict
264 anonymous > 0 */
265
266 if (lp_restrict_anonymous() > 0) {
267
268 /* schannel, so we must be ok */
269 if (p->pipe_bound && (p->auth.auth_type == PIPE_AUTH_TYPE_SCHANNEL)) {
270 return True;
271 }
272
273 if (p->server_info->guest) {
274 return False;
275 }
276 }
277
278 return True;
279 }