summaryrefslogtreecommitdiff
path: root/source3/sam/idmap_tdb.c
blob: c494cf595faafef10d1b122875ad397b29302d5d (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
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
/* 
   Unix SMB/CIFS implementation.

   idmap TDB backend

   Copyright (C) Tim Potter 2000
   Copyright (C) Anthony Liguori 2003
   Copyright (C) Simo Sorce 2003
   
   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"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP

/* High water mark keys */
#define HWM_GROUP  "GROUP HWM"
#define HWM_USER   "USER HWM"

/* idmap version determines auto-conversion */
#define IDMAP_VERSION 2

/* Globals */
static TDB_CONTEXT *idmap_tdb;

static struct idmap_state {

	/* User and group id pool */

	uid_t uid_low, uid_high;               /* Range of uids to allocate */
	gid_t gid_low, gid_high;               /* Range of gids to allocate */
} idmap_state;

/* Allocate either a user or group id from the pool */
static NTSTATUS db_allocate_id(unid_t *id, int id_type)
{
	int hwm;

	if (!id) return NT_STATUS_INVALID_PARAMETER;

	/* Get current high water mark */
	switch (id_type & ID_TYPEMASK) {
		case ID_USERID:
			if ((hwm = tdb_fetch_int32(idmap_tdb, HWM_USER)) == -1) {
				return NT_STATUS_INTERNAL_DB_ERROR;
			}

			if (hwm > idmap_state.uid_high) {
				DEBUG(0, ("idmap Fatal Error: UID range full!!\n"));
				return NT_STATUS_UNSUCCESSFUL;
			}

			(*id).uid = hwm++;

			/* Store new high water mark */
			tdb_store_int32(idmap_tdb, HWM_USER, hwm);
			break;
		case ID_GROUPID:
			if ((hwm = tdb_fetch_int32(idmap_tdb, HWM_GROUP)) == -1) {
				return NT_STATUS_INTERNAL_DB_ERROR;
			}

			if (hwm > idmap_state.gid_high) {
				DEBUG(0, ("idmap Fatal Error: GID range full!!\n"));
				return NT_STATUS_UNSUCCESSFUL;
			}

			(*id).gid = hwm++;
			
			/* Store new high water mark */
			tdb_store_int32(idmap_tdb, HWM_GROUP, hwm);
			break;
		default:
			return NT_STATUS_INVALID_PARAMETER;
	}

	return NT_STATUS_OK;
}

/* Get a sid from an id */
static NTSTATUS db_get_sid_from_id(DOM_SID *sid, unid_t id, int id_type)
{
	TDB_DATA key, data;
	fstring keystr;
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;

	if (!sid) return NT_STATUS_INVALID_PARAMETER;

	switch (id_type & ID_TYPEMASK) {
		case ID_USERID:
			slprintf(keystr, sizeof(keystr), "UID %d", id.uid);
			break;
		case ID_GROUPID:
			slprintf(keystr, sizeof(keystr), "GID %d", id.gid);
			break;
		default:
			return NT_STATUS_UNSUCCESSFUL;
	}

	key.dptr = keystr;
	key.dsize = strlen(keystr) + 1;

	data = tdb_fetch(idmap_tdb, key);

	if (data.dptr) {
		if (string_to_sid(sid, data.dptr)) {
			ret = NT_STATUS_OK;
		}
		SAFE_FREE(data.dptr);
	}

	return ret;
}

/* Get an id from a sid */
static NTSTATUS db_get_id_from_sid(unid_t *id, int *id_type, const DOM_SID *sid)
{
	TDB_DATA data, key;
	fstring keystr;
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;

	if (!sid || !id || !id_type) return NT_STATUS_INVALID_PARAMETER;

	/* Check if sid is present in database */
	sid_to_string(keystr, sid);

	key.dptr = keystr;
	key.dsize = strlen(keystr) + 1;

	data = tdb_fetch(idmap_tdb, key);

	if (data.dptr) {
		int type = *id_type & ID_TYPEMASK;
		fstring scanstr;

		if (type == ID_EMPTY || type == ID_USERID) {
			/* Parse and return existing uid */
			fstrcpy(scanstr, "UID %d");

			if (sscanf(data.dptr, scanstr, &((*id).uid)) == 1) {
				/* uid ok? */
				if (type == ID_EMPTY) {
					*id_type = ID_USERID;
				}
				ret = NT_STATUS_OK;
				goto idok;
			}
		}

		if (type == ID_EMPTY || type == ID_GROUPID) {
			/* Parse and return existing gid */
			fstrcpy(scanstr, "GID %d");

			if (sscanf(data.dptr, scanstr, &((*id).gid)) == 1) {
				/* gid ok? */
				if (type == ID_EMPTY) {
					*id_type = ID_GROUPID;
				}
				ret = NT_STATUS_OK;
			}
		}
idok:
		SAFE_FREE(data.dptr);

	} else if (!(*id_type & ID_NOMAP) &&
		   (((*id_type & ID_TYPEMASK) == ID_USERID)
		    || (*id_type & ID_TYPEMASK) == ID_GROUPID)) {

		/* Allocate a new id for this sid */
		ret = db_allocate_id(id, *id_type);
		if (NT_STATUS_IS_OK(ret)) {
			fstring keystr2;

			/* Store new id */
			if (*id_type & ID_USERID) {
				slprintf(keystr2, sizeof(keystr2), "UID %d", (*id).uid);
			} else {
				slprintf(keystr2, sizeof(keystr2), "GID %d", (*id).gid);
			}

			data.dptr = keystr2;
			data.dsize = strlen(keystr2) + 1;

			if (tdb_store(idmap_tdb, key, data, TDB_REPLACE) == -1) {
				/* TODO: print tdb error !! */
				return NT_STATUS_UNSUCCESSFUL;
			}
			if (tdb_store(idmap_tdb, data, key, TDB_REPLACE) == -1) {
				/* TODO: print tdb error !! */
				return NT_STATUS_UNSUCCESSFUL;
			}

			ret = NT_STATUS_OK;
		}
	}
	
	return ret;
}

static NTSTATUS db_set_mapping(DOM_SID *sid, unid_t id, int id_type)
{
	TDB_DATA ksid, kid;
	fstring ksidstr;
	fstring kidstr;

	if (!sid) return NT_STATUS_INVALID_PARAMETER;

	sid_to_string(ksidstr, sid);

	ksid.dptr = ksidstr;
	ksid.dsize = strlen(ksidstr) + 1;

	if (id_type & ID_USERID) {
		slprintf(kidstr, sizeof(kidstr), "UID %d", id.uid);
	} else if (id_type & ID_GROUPID) {
		slprintf(kidstr, sizeof(kidstr), "GID %d", id.gid);
	} else {
		return NT_STATUS_INVALID_PARAMETER;
	}

	kid.dptr = kidstr;
	kid.dsize = strlen(kidstr) + 1;

	if (tdb_store(idmap_tdb, ksid, kid, TDB_INSERT) == -1) {
		DEBUG(0, ("idb_set_mapping: tdb_store 1 error: %s\n", tdb_errorstr(idmap_tdb)));
		return NT_STATUS_UNSUCCESSFUL;
	}
	if (tdb_store(idmap_tdb, kid, ksid, TDB_INSERT) == -1) {
		DEBUG(0, ("idb_set_mapping: tdb_store 2 error: %s\n", tdb_errorstr(idmap_tdb)));
		return NT_STATUS_UNSUCCESSFUL;
	}
	return NT_STATUS_OK;
}

/*****************************************************************************
 Initialise idmap database. 
*****************************************************************************/
static NTSTATUS db_idmap_init(void)
{
	SMB_STRUCT_STAT stbuf;

	/* move to the new database on first startup */
	if (!file_exist(lock_path("idmap.tdb"), &stbuf)) {
		if (file_exist(lock_path("winbindd_idmap.tdb"), &stbuf)) {
			DEBUG(0, ("idmap_init: winbindd_idmap.tdb is present and idmap.tdb is not!\nPlease RUN winbindd first to convert the db to the new format!\n"));
			return NT_STATUS_UNSUCCESSFUL;
		}
	}

	/* Open tdb cache */
	if (!(idmap_tdb = tdb_open_log(lock_path("idmap.tdb"), 0,
				       TDB_DEFAULT, O_RDWR | O_CREAT,
				       0600))) {
		DEBUG(0, ("idmap_init: Unable to open idmap database\n"));
		return NT_STATUS_UNSUCCESSFUL;
	}

	/* Create high water marks for group and user id */
	if (tdb_fetch_int32(idmap_tdb, HWM_USER) == -1) {
		if (tdb_store_int32(idmap_tdb, HWM_USER, idmap_state.uid_low) == -1) {
			DEBUG(0, ("idmap_init: Unable to initialise user hwm in idmap database\n"));
			return NT_STATUS_INTERNAL_DB_ERROR;
		}
	}

	if (tdb_fetch_int32(idmap_tdb, HWM_GROUP) == -1) {
		if (tdb_store_int32(idmap_tdb, HWM_GROUP, idmap_state.gid_low) == -1) {
			DEBUG(0, ("idmap_init: Unable to initialise group hwm in idmap database\n"));
			return NT_STATUS_INTERNAL_DB_ERROR;
		}
	}

	return NT_STATUS_OK;
}

/* Close the tdb */
static NTSTATUS db_idmap_close(void)
{
	if (idmap_tdb) {
		if (tdb_close(idmap_tdb) == 0) {
			return NT_STATUS_OK;
		} else {
			return NT_STATUS_UNSUCCESSFUL;
		}
	}
	return NT_STATUS_OK;
}


/* Dump status information to log file.  Display different stuff based on
   the debug level:

   Debug Level        Information Displayed
   =================================================================
   0                  Percentage of [ug]id range allocated
   0                  High water marks (next allocated ids)
*/

#define DUMP_INFO 0

static void db_idmap_status(void)
{
	int user_hwm, group_hwm;

	DEBUG(0, ("winbindd idmap status:\n"));

	/* Get current high water marks */

	if ((user_hwm = tdb_fetch_int32(idmap_tdb, HWM_USER)) == -1) {
		DEBUG(DUMP_INFO,
		      ("\tCould not get userid high water mark!\n"));
	}

	if ((group_hwm = tdb_fetch_int32(idmap_tdb, HWM_GROUP)) == -1) {
		DEBUG(DUMP_INFO,
		      ("\tCould not get groupid high water mark!\n"));
	}

	/* Display next ids to allocate */

	if (user_hwm != -1) {
		DEBUG(DUMP_INFO,
		      ("\tNext userid to allocate is %d\n", user_hwm));
	}

	if (group_hwm != -1) {
		DEBUG(DUMP_INFO,
		      ("\tNext groupid to allocate is %d\n", group_hwm));
	}

	/* Display percentage of id range already allocated. */

	if (user_hwm != -1) {
		int num_users = user_hwm - idmap_state.uid_low;
		int total_users =
		    idmap_state.uid_high - idmap_state.uid_low;

		DEBUG(DUMP_INFO,
		      ("\tUser id range is %d%% full (%d of %d)\n",
		       num_users * 100 / total_users, num_users,
		       total_users));
	}

	if (group_hwm != -1) {
		int num_groups = group_hwm - idmap_state.gid_low;
		int total_groups =
		    idmap_state.gid_high - idmap_state.gid_low;

		DEBUG(DUMP_INFO,
		      ("\tGroup id range is %d%% full (%d of %d)\n",
		       num_groups * 100 / total_groups, num_groups,
		       total_groups));
	}

	/* Display complete mapping of users and groups to rids */
}

struct idmap_methods db_methods = {

	db_idmap_init,
	db_get_sid_from_id,
	db_get_id_from_sid,
	db_set_mapping,
	db_idmap_close,
	db_idmap_status

};

NTSTATUS idmap_reg_tdb(struct idmap_methods **meth)
{
	*meth = &db_methods;

	return NT_STATUS_OK;
}