summaryrefslogtreecommitdiff
path: root/source3/rpc_server/srv_lsa_hnd.c
blob: 5af1e8c265740dff8b071838409821f0efa7f214 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
/* 
 *  Unix SMB/CIFS implementation.
 *  RPC Pipe client / server routines
 *  Copyright (C) Andrew Tridgell              1992-1997,
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
 *  Copyright (C) Jeremy Allison			   2001.
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "includes.h"

/* This is the max handles across all instances of a pipe name. */
#ifndef MAX_OPEN_POLS
#define MAX_OPEN_POLS 1024
#endif

/****************************************************************************
 Hack as handles need to be persisant over lsa pipe closes so long as a samr
 pipe is open. JRA.
****************************************************************************/

static BOOL is_samr_lsa_pipe(const char *pipe_name)
{
	return (strstr(pipe_name, "samr") || strstr(pipe_name, "lsa"));
}

/****************************************************************************
 Initialise a policy handle list on a pipe. Handle list is shared between all
 pipes of the same name.
****************************************************************************/

BOOL init_pipe_handle_list(pipes_struct *p, char *pipe_name)
{
	pipes_struct *plist = get_first_internal_pipe();
	struct handle_list *hl = NULL;

	for (plist = get_first_internal_pipe(); plist; plist = get_next_internal_pipe(plist)) {
		if (strequal( plist->name, pipe_name) ||
				(is_samr_lsa_pipe(plist->name) && is_samr_lsa_pipe(pipe_name))) {
			if (!plist->pipe_handles) {
				pstring msg;
				slprintf(msg, sizeof(msg)-1, "init_pipe_handles: NULL pipe_handle pointer in pipe %s",
						pipe_name );
				smb_panic(msg);
			}
			hl = plist->pipe_handles;
			break;
		}
	}

	if (!hl) {
		/*
		 * No handle list for this pipe (first open of pipe).
		 * Create list.
		 */

		if ((hl = (struct handle_list *)malloc(sizeof(struct handle_list))) == NULL)
			return False;
		ZERO_STRUCTP(hl);

		DEBUG(10,("init_pipe_handles: created handle list for pipe %s\n", pipe_name ));
	}

	/*
	 * One more pipe is using this list.
	 */

	hl->pipe_ref_count++;

	/*
	 * Point this pipe at this list.
	 */

	p->pipe_handles = hl;

	DEBUG(10,("init_pipe_handles: pipe_handles ref count = %u for pipe %s\n",
			p->pipe_handles->pipe_ref_count, pipe_name ));

	return True;
}

/****************************************************************************
  find first available policy slot.  creates a policy handle for you.
****************************************************************************/

BOOL create_policy_hnd(pipes_struct *p, POLICY_HND *hnd, void (*free_fn)(void *), void *data_ptr)
{
	static uint32 pol_hnd_low  = 0;
	static uint32 pol_hnd_high = 0;

	struct policy *pol;

	if (p->pipe_handles->count > MAX_OPEN_POLS) {
		DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
				(int)p->pipe_handles->count));
		return False;
	}

	pol = (struct policy *)malloc(sizeof(*p));
	if (!pol) {
		DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
		return False;
	}

	ZERO_STRUCTP(pol);

	pol->data_ptr = data_ptr;
	pol->free_fn = free_fn;

	pol_hnd_low++;
	if (pol_hnd_low == 0)
		(pol_hnd_high)++;

	SIVAL(&pol->pol_hnd.data1, 0 , 0);  /* first bit must be null */
	SIVAL(&pol->pol_hnd.data2, 0 , pol_hnd_low ); /* second bit is incrementing */
	SSVAL(&pol->pol_hnd.data3, 0 , pol_hnd_high); /* second bit is incrementing */
	SSVAL(&pol->pol_hnd.data4, 0 , (pol_hnd_high>>16)); /* second bit is incrementing */
	SIVAL(pol->pol_hnd.data5, 0, time(NULL)); /* something random */
	SIVAL(pol->pol_hnd.data5, 4, sys_getpid()); /* something more random */

	DLIST_ADD(p->pipe_handles->Policy, pol);
	p->pipe_handles->count++;

	/*
	 * Ensure we don't idle this connection if a handle is open.
	 * Increment the number of files open on the first handle create.
	 */

	if (p->pipe_handles->count == 1)
		p->conn->num_files_open++;

	*hnd = pol->pol_hnd;
	
	DEBUG(4,("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
	dump_data(4, (char *)hnd, sizeof(*hnd));

	return True;
}

/****************************************************************************
  find policy by handle - internal version.
****************************************************************************/

static struct policy *find_policy_by_hnd_internal(pipes_struct *p, POLICY_HND *hnd, void **data_p)
{
	struct policy *pol;
	size_t i;

	if (data_p)
		*data_p = NULL;

	for (i = 0, pol=p->pipe_handles->Policy;pol;pol=pol->next, i++) {
		if (memcmp(&pol->pol_hnd, hnd, sizeof(*hnd)) == 0) {
			DEBUG(4,("Found policy hnd[%d] ", (int)i));
			dump_data(4, (char *)hnd, sizeof(*hnd));
			if (data_p)
				*data_p = pol->data_ptr;
			return pol;
		}
	}

	DEBUG(4,("Policy not found: "));
	dump_data(4, (char *)hnd, sizeof(*hnd));

	p->bad_handle_fault_state = True;

	return NULL;
}

/****************************************************************************
  find policy by handle
****************************************************************************/

BOOL find_policy_by_hnd(pipes_struct *p, POLICY_HND *hnd, void **data_p)
{
	return find_policy_by_hnd_internal(p, hnd, data_p) == NULL ? False : True;
}

/****************************************************************************
  Close a policy.
****************************************************************************/

BOOL close_policy_hnd(pipes_struct *p, POLICY_HND *hnd)
{
	struct policy *pol = find_policy_by_hnd_internal(p, hnd, NULL);

	if (!pol) {
		DEBUG(3,("Error closing policy\n"));
		return False;
	}

	DEBUG(3,("Closed policy\n"));

	if (pol->free_fn && pol->data_ptr)
		(*pol->free_fn)(pol->data_ptr);

	p->pipe_handles->count--;

	/*
	 * Ensure we can idle this connection if this is the last handle.
	 * Decrement the number of files open on the last handle delete.
	 */

	if (p->pipe_handles->count == 0)
		p->conn->num_files_open--;


	DLIST_REMOVE(p->pipe_handles->Policy, pol);

	ZERO_STRUCTP(pol);

	SAFE_FREE(pol);

	return True;
}

/****************************************************************************
 Close a pipe - free the handle list if it was the last pipe reference.
****************************************************************************/

void close_policy_by_pipe(pipes_struct *p)
{
	p->pipe_handles->pipe_ref_count--;

	if (p->pipe_handles->pipe_ref_count == 0) {
		/*
		 * Last pipe open on this list - free the list.
		 */
		while (p->pipe_handles->Policy)
			close_policy_hnd(p, &p->pipe_handles->Policy->pol_hnd);

		p->pipe_handles->Policy = NULL;
		p->pipe_handles->count = 0;

		SAFE_FREE(p->pipe_handles);
		DEBUG(10,("close_policy_by_pipe: deleted handle list for pipe %s\n", p->name ));
	}
}

/*******************************************************************
Shall we allow access to this rpc?  Currently this function
implements the 'restrict anonymous' setting by denying access to
anonymous users if the restrict anonymous level is > 0.  Further work
will be checking a security descriptor to determine whether a user
token has enough access to access the pipe.
********************************************************************/

BOOL pipe_access_check(pipes_struct *p)
{
	/* Don't let anonymous users access this RPC if restrict
	   anonymous > 0 */

	if (lp_restrict_anonymous() > 0) {
		user_struct *user = get_valid_user_struct(p->vuid);

		if (!user) {
			DEBUG(3, ("invalid vuid %d\n", p->vuid));
			return False;
		}

		if (user->guest)
			return False;
	}

	return True;
}