source: vendor/3.5.0/source3/winbindd/nss_info.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 10.2 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Idmap NSS headers
4
5 Copyright (C) Gerald Carter 2006
6 Copyright (C) Michael Adam 2008
7
8 This library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Lesser General Public
10 License as published by the Free Software Foundation; either
11 version 3 of the License, or (at your option) any later version.
12
13 This library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Library General Public License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "includes.h"
23#include "nss_info.h"
24
25static struct nss_function_entry *backends = NULL;
26static struct nss_function_entry *default_backend = NULL;
27static struct nss_domain_entry *nss_domain_list = NULL;
28
29/**********************************************************************
30 Get idmap nss methods.
31**********************************************************************/
32
33static struct nss_function_entry *nss_get_backend(const char *name )
34{
35 struct nss_function_entry *entry = backends;
36
37 for(entry = backends; entry; entry = entry->next) {
38 if ( strequal(entry->name, name) )
39 return entry;
40 }
41
42 return NULL;
43}
44
45/*********************************************************************
46 Allow a module to register itself as a backend.
47**********************************************************************/
48
49 NTSTATUS smb_register_idmap_nss(int version, const char *name, struct nss_info_methods *methods)
50{
51 struct nss_function_entry *entry;
52
53 if ((version != SMB_NSS_INFO_INTERFACE_VERSION)) {
54 DEBUG(0, ("smb_register_idmap_nss: Failed to register idmap_nss module.\n"
55 "The module was compiled against SMB_NSS_INFO_INTERFACE_VERSION %d,\n"
56 "current SMB_NSS_INFO_INTERFACE_VERSION is %d.\n"
57 "Please recompile against the current version of samba!\n",
58 version, SMB_NSS_INFO_INTERFACE_VERSION));
59 return NT_STATUS_OBJECT_TYPE_MISMATCH;
60 }
61
62 if (!name || !name[0] || !methods) {
63 DEBUG(0,("smb_register_idmap_nss: called with NULL pointer or empty name!\n"));
64 return NT_STATUS_INVALID_PARAMETER;
65 }
66
67 if ( nss_get_backend(name) ) {
68 DEBUG(0,("smb_register_idmap_nss: idmap module %s "
69 "already registered!\n", name));
70 return NT_STATUS_OBJECT_NAME_COLLISION;
71 }
72
73 entry = SMB_XMALLOC_P(struct nss_function_entry);
74 entry->name = smb_xstrdup(name);
75 entry->methods = methods;
76
77 DLIST_ADD(backends, entry);
78 DEBUG(5, ("smb_register_idmap_nss: Successfully added idmap "
79 "nss backend '%s'\n", name));
80
81 return NT_STATUS_OK;
82}
83
84/********************************************************************
85 *******************************************************************/
86
87static bool parse_nss_parm( const char *config, char **backend, char **domain )
88{
89 char *p;
90 char *q;
91 int len;
92
93 *backend = *domain = NULL;
94
95 if ( !config )
96 return False;
97
98 p = strchr( config, ':' );
99
100 /* if no : then the string must be the backend name only */
101
102 if ( !p ) {
103 *backend = SMB_STRDUP( config );
104 return (*backend != NULL);
105 }
106
107 /* split the string and return the two parts */
108
109 if ( strlen(p+1) > 0 ) {
110 *domain = SMB_STRDUP( p+1 );
111 }
112
113 len = PTR_DIFF(p,config)+1;
114 if ( (q = SMB_MALLOC_ARRAY( char, len )) == NULL ) {
115 SAFE_FREE( *backend );
116 return False;
117 }
118
119 StrnCpy( q, config, len-1);
120 q[len-1] = '\0';
121 *backend = q;
122
123 return True;
124}
125
126static NTSTATUS nss_domain_list_add_domain(const char *domain,
127 struct nss_function_entry *nss_backend)
128{
129 struct nss_domain_entry *nss_domain;
130
131 nss_domain = TALLOC_ZERO_P(nss_domain_list, struct nss_domain_entry);
132 if (!nss_domain) {
133 DEBUG(0, ("nss_domain_list_add_domain: talloc() failure!\n"));
134 return NT_STATUS_NO_MEMORY;
135 }
136
137 nss_domain->backend = nss_backend;
138 if (domain) {
139 nss_domain->domain = talloc_strdup(nss_domain, domain);
140 if (!nss_domain->domain) {
141 DEBUG(0, ("nss_domain_list_add_domain: talloc() "
142 "failure!\n"));
143 TALLOC_FREE(nss_domain);
144 return NT_STATUS_NO_MEMORY;
145 }
146 }
147
148 nss_domain->init_status = nss_domain->backend->methods->init(nss_domain);
149 if (!NT_STATUS_IS_OK(nss_domain->init_status)) {
150 DEBUG(0, ("nss_init: Failed to init backend '%s' for domain "
151 "'%s'!\n", nss_backend->name, nss_domain->domain));
152 }
153
154 DLIST_ADD(nss_domain_list, nss_domain);
155
156 DEBUG(10, ("Added domain '%s' with backend '%s' to nss_domain_list.\n",
157 domain, nss_backend->name));
158
159 return NT_STATUS_OK;
160}
161
162/********************************************************************
163 Each nss backend must not store global state, but rather be able
164 to initialize the state on a per domain basis.
165 *******************************************************************/
166
167 NTSTATUS nss_init( const char **nss_list )
168{
169 NTSTATUS status;
170 static NTSTATUS nss_initialized = NT_STATUS_UNSUCCESSFUL;
171 int i;
172 char *backend, *domain;
173 struct nss_function_entry *nss_backend;
174
175 /* check for previous successful initializations */
176
177 if ( NT_STATUS_IS_OK(nss_initialized) )
178 return NT_STATUS_OK;
179
180 /* The "template" backend should alqays be registered as it
181 is a static module */
182
183 if ( (nss_backend = nss_get_backend( "template" )) == NULL ) {
184 static_init_nss_info;
185 }
186
187 /* Create the list of nss_domains (loading any shared plugins
188 as necessary) */
189
190 for ( i=0; nss_list && nss_list[i]; i++ ) {
191
192 if ( !parse_nss_parm(nss_list[i], &backend, &domain) ) {
193 DEBUG(0,("nss_init: failed to parse \"%s\"!\n",
194 nss_list[i]));
195 continue;
196 }
197
198 DEBUG(10, ("parsed backend = '%s', domain = '%s'\n",
199 backend, domain));
200
201 /* validate the backend */
202
203 if ( (nss_backend = nss_get_backend( backend )) == NULL ) {
204 /* attempt to register the backend */
205 status = smb_probe_module( "nss_info", backend );
206 if ( !NT_STATUS_IS_OK(status) ) {
207 continue;
208 }
209
210 /* try again */
211 if ( (nss_backend = nss_get_backend( backend )) == NULL ) {
212 DEBUG(0,("nss_init: unregistered backend %s!. Skipping\n",
213 backend));
214 continue;
215 }
216 }
217
218 /*
219 * The first config item of the list without an explicit domain
220 * is treated as the default nss info backend.
221 */
222 if ((domain == NULL) && (default_backend == NULL)) {
223 DEBUG(10, ("nss_init: using '%s' as default backend.\n",
224 backend));
225 default_backend = nss_backend;
226 }
227
228 status = nss_domain_list_add_domain(domain, nss_backend);
229 if (!NT_STATUS_IS_OK(status)) {
230 return status;
231 }
232
233 /* cleanup */
234
235 SAFE_FREE( backend );
236 SAFE_FREE( domain );
237 }
238
239 if ( !nss_domain_list ) {
240 DEBUG(3,("nss_init: no nss backends configured. "
241 "Defaulting to \"template\".\n"));
242
243
244 /* we shouild default to use template here */
245 }
246
247 nss_initialized = NT_STATUS_OK;
248
249 return NT_STATUS_OK;
250}
251
252/********************************************************************
253 *******************************************************************/
254
255static struct nss_domain_entry *find_nss_domain( const char *domain )
256{
257 NTSTATUS status;
258 struct nss_domain_entry *p;
259
260 status = nss_init( lp_winbind_nss_info() );
261 if ( !NT_STATUS_IS_OK(status) ) {
262 DEBUG(4,("nss_get_info: Failed to init nss_info API (%s)!\n",
263 nt_errstr(status)));
264 return NULL;
265 }
266
267 for ( p=nss_domain_list; p; p=p->next ) {
268 if ( strequal( p->domain, domain ) )
269 break;
270 }
271
272 /* If we didn't find a match, then use the default nss backend */
273
274 if ( !p ) {
275 if (!default_backend) {
276 return NULL;
277 }
278
279 status = nss_domain_list_add_domain(domain, default_backend);
280 if (!NT_STATUS_IS_OK(status)) {
281 return NULL;
282 }
283
284 /*
285 * HACK ALERT:
286 * Here, we use the fact that the new domain was added at
287 * the beginning of the list...
288 */
289 p = nss_domain_list;
290 }
291
292 if ( !NT_STATUS_IS_OK( p->init_status ) ) {
293 p->init_status = p->backend->methods->init( p );
294 }
295
296 return p;
297}
298
299/********************************************************************
300 *******************************************************************/
301
302NTSTATUS nss_get_info( const char *domain, const DOM_SID *user_sid,
303 TALLOC_CTX *ctx,
304 ADS_STRUCT *ads, LDAPMessage *msg,
305 const char **homedir, const char **shell,
306 const char **gecos, gid_t *p_gid)
307{
308 struct nss_domain_entry *p;
309 struct nss_info_methods *m;
310
311 DEBUG(10, ("nss_get_info called for sid [%s] in domain '%s'\n",
312 sid_string_dbg(user_sid), domain?domain:"NULL"));
313
314 if ( (p = find_nss_domain( domain )) == NULL ) {
315 DEBUG(4,("nss_get_info: Failed to find nss domain pointer for %s\n",
316 domain ));
317 return NT_STATUS_NOT_FOUND;
318 }
319
320 m = p->backend->methods;
321
322 return m->get_nss_info( p, user_sid, ctx, ads, msg,
323 homedir, shell, gecos, p_gid );
324}
325
326/********************************************************************
327 *******************************************************************/
328
329 NTSTATUS nss_map_to_alias( TALLOC_CTX *mem_ctx, const char *domain,
330 const char *name, char **alias )
331{
332 struct nss_domain_entry *p;
333 struct nss_info_methods *m;
334
335 if ( (p = find_nss_domain( domain )) == NULL ) {
336 DEBUG(4,("nss_map_to_alias: Failed to find nss domain pointer for %s\n",
337 domain ));
338 return NT_STATUS_NOT_FOUND;
339 }
340
341 m = p->backend->methods;
342
343 return m->map_to_alias(mem_ctx, p, name, alias);
344}
345
346
347/********************************************************************
348 *******************************************************************/
349
350 NTSTATUS nss_map_from_alias( TALLOC_CTX *mem_ctx, const char *domain,
351 const char *alias, char **name )
352{
353 struct nss_domain_entry *p;
354 struct nss_info_methods *m;
355
356 if ( (p = find_nss_domain( domain )) == NULL ) {
357 DEBUG(4,("nss_map_from_alias: Failed to find nss domain pointer for %s\n",
358 domain ));
359 return NT_STATUS_NOT_FOUND;
360 }
361
362 m = p->backend->methods;
363
364 return m->map_from_alias( mem_ctx, p, alias, name );
365}
366
367/********************************************************************
368 *******************************************************************/
369
370 NTSTATUS nss_close( const char *parameters )
371{
372 struct nss_domain_entry *p = nss_domain_list;
373 struct nss_domain_entry *q;
374
375 while ( p && p->backend && p->backend->methods ) {
376 /* close the backend */
377 p->backend->methods->close_fn();
378
379 /* free the memory */
380 q = p;
381 p = p->next;
382 TALLOC_FREE( q );
383 }
384
385 return NT_STATUS_OK;
386}
387
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