summaryrefslogtreecommitdiffstats
path: root/source3/winbindd/nss_info.c
blob: 9c502e84ef0609c8771bc63db0522ae69000d921 (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
/*
   Unix SMB/CIFS implementation.
   Idmap NSS headers

   Copyright (C) Gerald Carter             2006
   Copyright (C) Michael Adam 2008

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "nss_info.h"

static struct nss_function_entry *backends = NULL;
static struct nss_function_entry *default_backend = NULL;
static struct nss_domain_entry *nss_domain_list = NULL;

/**********************************************************************
 Get idmap nss methods.
**********************************************************************/

static struct nss_function_entry *nss_get_backend(const char *name )
{
	struct nss_function_entry *entry = backends;

	for(entry = backends; entry; entry = entry->next) {
		if ( strequal(entry->name, name) )
			return entry;
	}

	return NULL;
}

/*********************************************************************
 Allow a module to register itself as a backend.
**********************************************************************/

 NTSTATUS smb_register_idmap_nss(int version, const char *name,
				 const struct nss_info_methods *methods)
{
	struct nss_function_entry *entry;

	if ((version != SMB_NSS_INFO_INTERFACE_VERSION)) {
		DEBUG(0, ("smb_register_idmap_nss: Failed to register idmap_nss module.\n"
			  "The module was compiled against SMB_NSS_INFO_INTERFACE_VERSION %d,\n"
			  "current SMB_NSS_INFO_INTERFACE_VERSION is %d.\n"
			  "Please recompile against the current version of samba!\n",
			  version, SMB_NSS_INFO_INTERFACE_VERSION));
		return NT_STATUS_OBJECT_TYPE_MISMATCH;
	}

	if (!name || !name[0] || !methods) {
		DEBUG(0,("smb_register_idmap_nss: called with NULL pointer or empty name!\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}

	if ( nss_get_backend(name) ) {
		DEBUG(5,("smb_register_idmap_nss: idmap module %s "
			 "already registered!\n", name));
		return NT_STATUS_OBJECT_NAME_COLLISION;
	}

	entry = SMB_XMALLOC_P(struct nss_function_entry);
	entry->name = smb_xstrdup(name);
	entry->methods = methods;

	DLIST_ADD(backends, entry);
	DEBUG(5, ("smb_register_idmap_nss: Successfully added idmap "
		  "nss backend '%s'\n", name));

	return NT_STATUS_OK;
}

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

static bool parse_nss_parm(TALLOC_CTX *mem_ctx,
			   const char *config,
			   char **backend,
			   char **domain)
{
	char *p;

	*backend = *domain = NULL;

	if ( !config )
		return False;

	p = strchr( config, ':' );

	/* if no : then the string must be the backend name only */

	if ( !p ) {
		*backend = talloc_strdup(mem_ctx, config);
		return (*backend != NULL);
	}

	/* split the string and return the two parts */

	if ( strlen(p+1) > 0 ) {
		*domain = talloc_strdup(mem_ctx, p + 1);
	}

	*backend = talloc_strndup(mem_ctx, config, PTR_DIFF(p, config));
	return (*backend != NULL);
}

static NTSTATUS nss_domain_list_add_domain(const char *domain,
					   struct nss_function_entry *nss_backend)
{
	struct nss_domain_entry *nss_domain;

	nss_domain = talloc_zero(nss_domain_list, struct nss_domain_entry);
	if (!nss_domain) {
		DEBUG(0, ("nss_domain_list_add_domain: talloc() failure!\n"));
		return NT_STATUS_NO_MEMORY;
	}

	nss_domain->backend = nss_backend;
	if (domain) {
		nss_domain->domain  = talloc_strdup(nss_domain, domain);
		if (!nss_domain->domain) {
			DEBUG(0, ("nss_domain_list_add_domain: talloc() "
				  "failure!\n"));
			TALLOC_FREE(nss_domain);
			return NT_STATUS_NO_MEMORY;
		}
	}

	nss_domain->init_status = nss_domain->backend->methods->init(nss_domain);
	if (!NT_STATUS_IS_OK(nss_domain->init_status))  {
		DEBUG(0, ("nss_init: Failed to init backend '%s' for domain "
			  "'%s'!\n", nss_backend->name, nss_domain->domain));
	}

	DLIST_ADD(nss_domain_list, nss_domain);

	DEBUG(10, ("Added domain '%s' with backend '%s' to nss_domain_list.\n",
		   domain, nss_backend->name));

	return NT_STATUS_OK;
}

/********************************************************************
 Each nss backend must not store global state, but rather be able
 to initialize the state on a per domain basis.
 *******************************************************************/

static NTSTATUS nss_init(const char **nss_list)
{
	NTSTATUS status;
	static bool nss_initialized = false;
	int i;
	char *backend = NULL, *domain = NULL;
	struct nss_function_entry *nss_backend;
	TALLOC_CTX *frame;

	/* check for previous successful initializations */

	if (nss_initialized) {
		return NT_STATUS_OK;
	}

	frame = talloc_stackframe();

	/* The "template" backend should always be registered as it
	   is a static module */

	nss_backend = nss_get_backend("template");
	if (nss_backend == NULL) {
		static_init_nss_info(NULL);
	}

	/* Create the list of nss_domains (loading any shared plugins
	   as necessary) */

	for ( i=0; nss_list && nss_list[i]; i++ ) {
		bool ok;

		ok = parse_nss_parm(frame, nss_list[i], &backend, &domain);
		if (!ok) {
			DEBUG(0,("nss_init: failed to parse \"%s\"!\n",
				 nss_list[i]));
			continue;
		}

		DEBUG(10, ("parsed backend = '%s', domain = '%s'\n",
			   backend, domain));

		/* validate the backend */

		nss_backend = nss_get_backend(backend);
		if (nss_backend == NULL) {
			/*
			 * This is a freaking hack. We don't have proper
			 * modules for nss_info backends. Right now we have
			 * our standard nss_info backends in the ad backend.
			 */
			status = smb_probe_module("idmap", "ad");
			if ( !NT_STATUS_IS_OK(status) ) {
				continue;
			}
		}

		nss_backend = nss_get_backend(backend);
		if (nss_backend == NULL) {
			/* attempt to register the backend */
			status = smb_probe_module( "nss_info", backend );
			if ( !NT_STATUS_IS_OK(status) ) {
				continue;
			}
		}

		/* try again */
		nss_backend = nss_get_backend(backend);
		if (nss_backend == NULL) {
			DEBUG(0, ("nss_init: unregistered backend %s!. "
				  "Skipping\n", backend));
			continue;
		}

		/*
		 * The first config item of the list without an explicit domain
		 * is treated as the default nss info backend.
		 */
		if ((domain == NULL) && (default_backend == NULL)) {
			DEBUG(10, ("nss_init: using '%s' as default backend.\n",
				   backend));
			default_backend = nss_backend;
		}

		status = nss_domain_list_add_domain(domain, nss_backend);
		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}

		/* cleanup */

		TALLOC_FREE(domain);
		TALLOC_FREE(backend);
	}


	if ( !nss_domain_list ) {
		DEBUG(3,("nss_init: no nss backends configured.  "
			 "Defaulting to \"template\".\n"));


		/* we should default to use template here */
	}

	nss_initialized = true;

	TALLOC_FREE(frame);
	return NT_STATUS_OK;
}

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

static struct nss_domain_entry *find_nss_domain( const char *domain )
{
	NTSTATUS status;
	struct nss_domain_entry *p;

	status = nss_init( lp_winbind_nss_info() );
	if ( !NT_STATUS_IS_OK(status) ) {
		DEBUG(4,("find_nss_domain: Failed to init nss_info API "
			 "(%s)!\n", nt_errstr(status)));
		return NULL;
	}

	for ( p=nss_domain_list; p; p=p->next ) {
		if ( strequal( p->domain, domain ) )
			break;
	}

	/* If we didn't find a match, then use the default nss backend */

	if ( !p ) {
		if (!default_backend) {
			return NULL;
		}

		status = nss_domain_list_add_domain(domain, default_backend);
		if (!NT_STATUS_IS_OK(status)) {
			return NULL;
		}

		/*
		 * HACK ALERT:
		 * Here, we use the fact that the new domain was added at
		 * the beginning of the list...
		 */
		p = nss_domain_list;
	}

	if ( !NT_STATUS_IS_OK( p->init_status ) ) {
	       p->init_status = p->backend->methods->init( p );
	}

	return p;
}

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

 NTSTATUS nss_map_to_alias( TALLOC_CTX *mem_ctx, const char *domain,
			    const char *name, char **alias )
{
	struct nss_domain_entry *p;
	const struct nss_info_methods *m;

	if ( (p = find_nss_domain( domain )) == NULL ) {
		DEBUG(4,("nss_map_to_alias: Failed to find nss domain pointer for %s\n",
			 domain ));
		return NT_STATUS_NOT_FOUND;
	}

	m = p->backend->methods;

	return m->map_to_alias(mem_ctx, p, name, alias);
}


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

 NTSTATUS nss_map_from_alias( TALLOC_CTX *mem_ctx, const char *domain,
			      const char *alias, char **name )
{
	struct nss_domain_entry *p;
	const struct nss_info_methods *m;

	if ( (p = find_nss_domain( domain )) == NULL ) {
		DEBUG(4,("nss_map_from_alias: Failed to find nss domain pointer for %s\n",
			 domain ));
		return NT_STATUS_NOT_FOUND;
	}

	m = p->backend->methods;

	return m->map_from_alias( mem_ctx, p, alias, name );
}

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

 NTSTATUS nss_close( const char *parameters )
{
	struct nss_domain_entry *p = nss_domain_list;
	struct nss_domain_entry *q;

	while ( p && p->backend && p->backend->methods ) {
		/* close the backend */
		p->backend->methods->close_fn();

		/* free the memory */
		q = p;
		p = p->next;
		TALLOC_FREE( q );
	}

	return NT_STATUS_OK;
}