summaryrefslogtreecommitdiff
path: root/source3/winbindd/idmap_hash/idmap_hash.c
blob: 7d4dd2b5ab01578ff758cd6374a83d3aae364f36 (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
390
391
392
393
394
395
396
397
398
399
400
401
402
403
/*
 *  idmap_hash.c
 *
 * Copyright (C) Gerald Carter  <jerry@samba.org>      2007 - 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"
#include "winbindd/winbindd.h"
#include "idmap_hash.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP

struct sid_hash_table {
	DOM_SID *sid;
};

struct sid_hash_table *hashed_domains = NULL;

/*********************************************************************
 Hash a domain SID (S-1-5-12-aaa-bbb-ccc) to a 12bit number
 ********************************************************************/

static uint32_t hash_domain_sid(const DOM_SID *sid)
{
	uint32_t hash;

	if (sid->num_auths != 4)
		return 0;

	/* XOR the last three subauths */

	hash = ((sid->sub_auths[1] ^ sid->sub_auths[2]) ^ sid->sub_auths[3]);

	/* Take all 32-bits into account when generating the 12-bit
	   hash value */
	hash = (((hash & 0xFFF00000) >> 20)
		+ ((hash & 0x000FFF00) >> 8)
		+ (hash & 0x000000FF)) & 0x0000FFF;

	/* return a 12-bit hash value */

	return hash;
}

/*********************************************************************
 Hash a Relative ID to a 20 bit number
 ********************************************************************/

static uint32_t hash_rid(uint32_t rid)
{
	/* 20 bits for the rid which allows us to support
	   the first 100K users/groups in a domain */

	return (rid & 0x0007FFFF);
}

/*********************************************************************
 ********************************************************************/

static uint32_t combine_hashes(uint32_t h_domain,
			       uint32_t h_rid)
{
	uint32_t return_id = 0;

	/* shift the hash_domain 19 bits to the left and OR with the
	   hash_rid */

	return_id = ((h_domain<<19) | h_rid);

	return return_id;
}

/*********************************************************************
 ********************************************************************/

static void separate_hashes(uint32_t id,
			    uint32_t *h_domain,
			    uint32_t *h_rid)
{
	*h_rid = id & 0x0007FFFF;
	*h_domain = (id & 0x7FF80000) >> 19;

	return;
}


/*********************************************************************
 ********************************************************************/

static NTSTATUS be_init(struct idmap_domain *dom,
			const char *params)
{
	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
	struct winbindd_tdc_domain *dom_list = NULL;
	size_t num_domains = 0;
	int i;

	/* If the domain SID hash talbe has been initialized, assume
	   that we completed this function previously */

	if ( hashed_domains ) {
		nt_status = NT_STATUS_OK;
		goto done;
	}

	if (!wcache_tdc_fetch_list(&dom_list, &num_domains)) {
		nt_status = NT_STATUS_TRUSTED_DOMAIN_FAILURE;
		BAIL_ON_NTSTATUS_ERROR(nt_status);
	}

	/* Create the hash table of domain SIDs */

	hashed_domains = TALLOC_ZERO_ARRAY(NULL, struct sid_hash_table, 4096);
	BAIL_ON_PTR_NT_ERROR(hashed_domains, nt_status);

	/* create the hash table of domain SIDs */

	for (i=0; i<num_domains; i++) {
		uint32_t hash;

		if (is_null_sid(&dom_list[i].sid))
			continue;
		if ((hash = hash_domain_sid(&dom_list[i].sid)) == 0)
			continue;

		DEBUG(5,("hash:be_init() Adding %s (%s) -> %d\n",
			 dom_list[i].domain_name,
			 sid_string_dbg(&dom_list[i].sid),
			 hash));

		hashed_domains[hash].sid = talloc(hashed_domains, DOM_SID);
		sid_copy(hashed_domains[hash].sid, &dom_list[i].sid);
	}

done:
	return nt_status;
}

/*********************************************************************
 ********************************************************************/

static NTSTATUS unixids_to_sids(struct idmap_domain *dom,
				struct id_map **ids)
{
	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
	int i;

	/* initialize the status to avoid suprise */
	for (i = 0; ids[i]; i++) {
		ids[i]->status = ID_UNKNOWN;
	}
	
	nt_status = be_init(dom, NULL);
	BAIL_ON_NTSTATUS_ERROR(nt_status);

	if (!ids) {
		nt_status = NT_STATUS_INVALID_PARAMETER;
		BAIL_ON_NTSTATUS_ERROR(nt_status);
	}

	for (i=0; ids[i]; i++) {
		uint32_t h_domain, h_rid;

		ids[i]->status = ID_UNMAPPED;

		separate_hashes(ids[i]->xid.id, &h_domain, &h_rid);

		/* Make sure the caller allocated memor for us */

		if (!ids[i]->sid) {
			nt_status = NT_STATUS_INVALID_PARAMETER;
			BAIL_ON_NTSTATUS_ERROR(nt_status);
		}

		/* If the domain hash doesn't find a SID in the table,
		   skip it */

		if (!hashed_domains[h_domain].sid)
			continue;

		sid_copy(ids[i]->sid, hashed_domains[h_domain].sid);
		sid_append_rid(ids[i]->sid, h_rid);
		ids[i]->status = ID_MAPPED;
	}

done:
	return nt_status;
}

/*********************************************************************
 ********************************************************************/

static NTSTATUS sids_to_unixids(struct idmap_domain *dom,
				struct id_map **ids)
{
	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
	int i;

	/* initialize the status to avoid suprise */
	for (i = 0; ids[i]; i++) {
		ids[i]->status = ID_UNKNOWN;
	}
	
	nt_status = be_init(dom, NULL);
	BAIL_ON_NTSTATUS_ERROR(nt_status);

	if (!ids) {
		nt_status = NT_STATUS_INVALID_PARAMETER;
		BAIL_ON_NTSTATUS_ERROR(nt_status);
	}

	for (i=0; ids[i]; i++) {
		DOM_SID sid;
		uint32_t rid;
		uint32_t h_domain, h_rid;

		ids[i]->status = ID_UNMAPPED;

		sid_copy(&sid, ids[i]->sid);
		sid_split_rid(&sid, &rid);

		h_domain = hash_domain_sid(&sid);
		h_rid = hash_rid(rid);

		/* Check that both hashes are non-zero*/

		if (h_domain && h_rid) {
			ids[i]->xid.id = combine_hashes(h_domain, h_rid);
			ids[i]->status = ID_MAPPED;
		}
	}

done:
	return nt_status;
}

/*********************************************************************
 ********************************************************************/

static NTSTATUS be_close(struct idmap_domain *dom)
{
	if (hashed_domains)
		talloc_free(hashed_domains);

	return NT_STATUS_OK;
}

/*********************************************************************
 ********************************************************************/

static NTSTATUS nss_hash_init(struct nss_domain_entry *e )
{
	return be_init(NULL, NULL);
}

/**********************************************************************
 *********************************************************************/

static NTSTATUS nss_hash_get_info(struct nss_domain_entry *e,
				    const DOM_SID *sid,
				    TALLOC_CTX *ctx,
				    ADS_STRUCT *ads,
				    LDAPMessage *msg,
				    const char **homedir,
				    const char **shell,
				    const char **gecos,
				    gid_t *p_gid )
{
	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;

	nt_status = nss_hash_init(e);
	BAIL_ON_NTSTATUS_ERROR(nt_status);

	if (!homedir || !shell || !gecos) {
		nt_status = NT_STATUS_INVALID_PARAMETER;
		BAIL_ON_NTSTATUS_ERROR(nt_status);
	}

	*homedir = talloc_strdup(ctx, lp_template_homedir());
	BAIL_ON_PTR_NT_ERROR(*homedir, nt_status);

	*shell   = talloc_strdup(ctx, lp_template_shell());
	BAIL_ON_PTR_NT_ERROR(*shell, nt_status);

	*gecos   = NULL;

	/* Initialize the gid so that the upper layer fills
	   in the proper Windows primary group */

	if (*p_gid) {
		*p_gid = (gid_t)-1;
	}

done:
	return nt_status;
}

/**********************************************************************
 *********************************************************************/

static NTSTATUS nss_hash_map_to_alias(TALLOC_CTX *mem_ctx,
					struct nss_domain_entry *e,
					const char *name,
					char **alias)
{
	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
	const char *value;

	value = talloc_asprintf(mem_ctx, "%s\\%s", e->domain, name);
	BAIL_ON_PTR_NT_ERROR(value, nt_status);

	nt_status = mapfile_lookup_key(mem_ctx, value, alias);
	BAIL_ON_NTSTATUS_ERROR(nt_status);

done:
	return nt_status;
}

/**********************************************************************
 *********************************************************************/

static NTSTATUS nss_hash_map_from_alias(TALLOC_CTX *mem_ctx,
					  struct nss_domain_entry *e,
					  const char *alias,
					  char **name)
{
	return mapfile_lookup_value(mem_ctx, alias, name);
}

/**********************************************************************
 *********************************************************************/

static NTSTATUS nss_hash_close(void)
{
	return NT_STATUS_OK;
}

/*********************************************************************
 Dispatch Tables for IDMap and NssInfo Methods
********************************************************************/

static struct idmap_methods hash_idmap_methods = {
	.init            = be_init,
	.unixids_to_sids = unixids_to_sids,
	.sids_to_unixids = sids_to_unixids,
	.close_fn        = be_close
};

static struct nss_info_methods hash_nss_methods = {
	.init           = nss_hash_init,
	.get_nss_info   = nss_hash_get_info,
	.map_to_alias   = nss_hash_map_to_alias,
	.map_from_alias = nss_hash_map_from_alias,
	.close_fn       = nss_hash_close
};

/**********************************************************************
 Register with the idmap and idmap_nss subsystems. We have to protect
 against the idmap and nss_info interfaces being in a half-registered
 state.
 **********************************************************************/

NTSTATUS idmap_hash_init(void)
{
	static NTSTATUS idmap_status = NT_STATUS_UNSUCCESSFUL;
	static NTSTATUS nss_status = NT_STATUS_UNSUCCESSFUL;

	if ( !NT_STATUS_IS_OK(idmap_status) ) {
		idmap_status =  smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
						   "hash", &hash_idmap_methods);

		if ( !NT_STATUS_IS_OK(idmap_status) ) {
			DEBUG(0,("Failed to register hash idmap plugin.\n"));
			return idmap_status;
		}
	}

	if ( !NT_STATUS_IS_OK(nss_status) ) {
		nss_status = smb_register_idmap_nss(SMB_NSS_INFO_INTERFACE_VERSION,
						    "hash", &hash_nss_methods);
		if ( !NT_STATUS_IS_OK(nss_status) ) {
			DEBUG(0,("Failed to register hash idmap nss plugin.\n"));
			return nss_status;
		}
	}

	return NT_STATUS_OK;
}