summaryrefslogtreecommitdiff
path: root/source3/libsmb/samlogon_cache.c
blob: 0d855f4c6c7f40f7a850b963d144b8d954ea1998 (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
/*
   Unix SMB/CIFS implementation.
   Net_sam_logon info3 helpers
   Copyright (C) Alexander Bokovoy              2002.
   Copyright (C) Andrew Bartlett                2002.
   Copyright (C) Gerald Carter			2003.
   Copyright (C) Tim Potter			2003.
   Copyright (C) Guenther Deschner		2008.

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

#define NETSAMLOGON_TDB	"netsamlogon_cache.tdb"

static TDB_CONTEXT *netsamlogon_tdb = NULL;

/***********************************************************************
 open the tdb
 ***********************************************************************/

bool netsamlogon_cache_init(void)
{
	if (!netsamlogon_tdb) {
		netsamlogon_tdb = tdb_open_log(lock_path(NETSAMLOGON_TDB), 0,
					       TDB_DEFAULT, O_RDWR | O_CREAT, 0600);
	}

	return (netsamlogon_tdb != NULL);
}


/***********************************************************************
 Shutdown samlogon_cache database
***********************************************************************/

bool netsamlogon_cache_shutdown(void)
{
	if (netsamlogon_tdb) {
		return (tdb_close(netsamlogon_tdb) == 0);
	}

	return true;
}

/***********************************************************************
 Clear cache getpwnam and getgroups entries from the winbindd cache
***********************************************************************/

void netsamlogon_clear_cached_user(TDB_CONTEXT *tdb, struct netr_SamInfo3 *info3)
{
	bool got_tdb = false;
	DOM_SID sid;
	fstring key_str, sid_string;

	/* We may need to call this function from smbd which will not have
	   winbindd_cache.tdb open.  Open the tdb if a NULL is passed. */

	if (!tdb) {
		tdb = tdb_open_log(lock_path("winbindd_cache.tdb"),
				   WINBINDD_CACHE_TDB_DEFAULT_HASH_SIZE,
				   TDB_DEFAULT, O_RDWR, 0600);
		if (!tdb) {
			DEBUG(5, ("netsamlogon_clear_cached_user: failed to open cache\n"));
			return;
		}
		got_tdb = true;
	}

	sid_copy(&sid, info3->base.domain_sid);
	sid_append_rid(&sid, info3->base.rid);

	/* Clear U/SID cache entry */

	fstr_sprintf(key_str, "U/%s", sid_to_fstring(sid_string, &sid));

	DEBUG(10, ("netsamlogon_clear_cached_user: clearing %s\n", key_str));

	tdb_delete(tdb, string_tdb_data(key_str));

	/* Clear UG/SID cache entry */

	fstr_sprintf(key_str, "UG/%s", sid_to_fstring(sid_string, &sid));

	DEBUG(10, ("netsamlogon_clear_cached_user: clearing %s\n", key_str));

	tdb_delete(tdb, string_tdb_data(key_str));

	if (got_tdb) {
		tdb_close(tdb);
	}
}

/***********************************************************************
 Store a netr_SamInfo3 structure in a tdb for later user
 username should be in UTF-8 format
***********************************************************************/

bool netsamlogon_cache_store(const char *username, struct netr_SamInfo3 *info3)
{
	TDB_DATA data;
	fstring keystr, tmp;
	bool result = false;
	DOM_SID	user_sid;
	time_t t = time(NULL);
	TALLOC_CTX *mem_ctx;
	DATA_BLOB blob;
	enum ndr_err_code ndr_err;
	struct netsamlogoncache_entry r;

	if (!info3) {
		return false;
	}

	if (!netsamlogon_cache_init()) {
		DEBUG(0,("netsamlogon_cache_store: cannot open %s for write!\n",
			NETSAMLOGON_TDB));
		return false;
	}

	sid_copy(&user_sid, info3->base.domain_sid);
	sid_append_rid(&user_sid, info3->base.rid);

	/* Prepare key as DOMAIN-SID/USER-RID string */
	slprintf(keystr, sizeof(keystr), "%s", sid_to_fstring(tmp, &user_sid));

	DEBUG(10,("netsamlogon_cache_store: SID [%s]\n", keystr));

	/* Prepare data */

	if (!(mem_ctx = TALLOC_P( NULL, int))) {
		DEBUG(0,("netsamlogon_cache_store: talloc() failed!\n"));
		return false;
	}

	/* only Samba fills in the username, not sure why NT doesn't */
	/* so we fill it in since winbindd_getpwnam() makes use of it */

	if (!info3->base.account_name.string) {
		info3->base.account_name.string = talloc_strdup(mem_ctx, username);
	}

	r.timestamp = t;
	r.info3 = *info3;

	if (DEBUGLEVEL >= 10) {
		NDR_PRINT_DEBUG(netsamlogoncache_entry, &r);
	}

	ndr_err = ndr_push_struct_blob(&blob, mem_ctx, &r,
				       (ndr_push_flags_fn_t)ndr_push_netsamlogoncache_entry);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		DEBUG(0,("netsamlogon_cache_store: failed to push entry to cache\n"));
		TALLOC_FREE(mem_ctx);
		return false;
	}

	data.dsize = blob.length;
	data.dptr = blob.data;

	if (tdb_store_bystring(netsamlogon_tdb, keystr, data, TDB_REPLACE) != -1) {
		result = true;
	}

	TALLOC_FREE(mem_ctx);

	return result;
}

/***********************************************************************
 Retrieves a netr_SamInfo3 structure from a tdb.  Caller must
 free the user_info struct (malloc()'d memory)
***********************************************************************/

struct netr_SamInfo3 *netsamlogon_cache_get(TALLOC_CTX *mem_ctx, const DOM_SID *user_sid)
{
	struct netr_SamInfo3 *info3 = NULL;
	TDB_DATA data;
	fstring keystr, tmp;
	enum ndr_err_code ndr_err;
	DATA_BLOB blob;
	struct netsamlogoncache_entry r;

	if (!netsamlogon_cache_init()) {
		DEBUG(0,("netsamlogon_cache_get: cannot open %s for write!\n",
			NETSAMLOGON_TDB));
		return false;
	}

	/* Prepare key as DOMAIN-SID/USER-RID string */
	slprintf(keystr, sizeof(keystr), "%s", sid_to_fstring(tmp, user_sid));
	DEBUG(10,("netsamlogon_cache_get: SID [%s]\n", keystr));
	data = tdb_fetch_bystring( netsamlogon_tdb, keystr );

	if (!data.dptr) {
		return NULL;
	}

	info3 = TALLOC_ZERO_P(mem_ctx, struct netr_SamInfo3);
	if (!info3) {
		goto done;
	}

	blob.data = (uint8 *)data.dptr;
	blob.length = data.dsize;

	ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
				      (ndr_pull_flags_fn_t)ndr_pull_netsamlogoncache_entry);

	if (DEBUGLEVEL >= 10) {
		NDR_PRINT_DEBUG(netsamlogoncache_entry, &r);
	}

	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		DEBUG(0,("netsamlogon_cache_get: failed to pull entry from cache\n"));
		tdb_delete(netsamlogon_tdb, data);
		goto done;
	}

	info3 = (struct netr_SamInfo3 *)talloc_memdup(mem_ctx, &r.info3,
						      sizeof(r.info3));

 done:
	SAFE_FREE(data.dptr);

	return info3;

#if 0	/* The netsamlogon cache needs to hang around.  Something about
	   this feels wrong, but it is the only way we can get all of the
	   groups.  The old universal groups cache didn't expire either.
	   --jerry */
	{
		time_t		now = time(NULL);
		uint32		time_diff;

		/* is the entry expired? */
		time_diff = now - t;

		if ( (time_diff < 0 ) || (time_diff > lp_winbind_cache_time()) ) {
			DEBUG(10,("netsamlogon_cache_get: cache entry expired \n"));
			tdb_delete( netsamlogon_tdb, key );
			TALLOC_FREE( user );
		}
	}
#endif
}

bool netsamlogon_cache_have(const DOM_SID *user_sid)
{
	TALLOC_CTX *mem_ctx = talloc_init("netsamlogon_cache_have");
	struct netr_SamInfo3 *info3 = NULL;
	bool result;

	if (!mem_ctx)
		return False;

	info3 = netsamlogon_cache_get(mem_ctx, user_sid);

	result = (info3 != NULL);

	talloc_destroy(mem_ctx);

	return result;
}