source: trunk-3.0/source/nsswitch/nss_info.c@ 101

Last change on this file since 101 was 62, checked in by Paul Smedley, 18 years ago

Update source to 3.0.25c level
File size: 8.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Idmap NSS headers
4
5 Copyright (C) Gerald Carter 2006
6
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
11
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
16
17 You should have received a copy of the GNU Library General Public
18 License along with this library; if not, write to the
19 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA.
21*/
22
23#include "includes.h"
24#include "nss_info.h"
25
26static struct nss_function_entry *backends = 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
126/********************************************************************
127 Each nss backend must not store global state, but rather be able
128 to initialize the state on a per domain basis.
129 *******************************************************************/
130
131 NTSTATUS nss_init( const char **nss_list )
132{
133 NTSTATUS status;
134 static NTSTATUS nss_initialized = NT_STATUS_UNSUCCESSFUL;
135 int i;
136 char *backend, *domain;
137 struct nss_function_entry *nss_backend;
138 struct nss_domain_entry *nss_domain;
139
140 /* check for previous successful initializations */
141
142 if ( NT_STATUS_IS_OK(nss_initialized) )
143 return NT_STATUS_OK;
144
145 /* The "template" backend should alqays be registered as it
146 is a static module */
147
148 if ( (nss_backend = nss_get_backend( "template" )) == NULL ) {
149 static_init_nss_info;
150 }
151
152 /* Create the list of nss_domains (loading any shared plugins
153 as necessary) */
154
155 for ( i=0; nss_list && nss_list[i]; i++ ) {
156
157 if ( !parse_nss_parm(nss_list[i], &backend, &domain) ) {
158 DEBUG(0,("nss_init: failed to parse \"%s\"!\n",
159 nss_list[i]));
160 continue;
161 }
162
163 /* validate the backend */
164
165 if ( (nss_backend = nss_get_backend( backend )) == NULL ) {
166 /* attempt to register the backend */
167 status = smb_probe_module( "nss_info", backend );
168 if ( !NT_STATUS_IS_OK(status) ) {
169 continue;
170 }
171
172 /* try again */
173 if ( (nss_backend = nss_get_backend( backend )) == NULL ) {
174 DEBUG(0,("nss_init: unregistered backend %s!. Skipping\n",
175 backend));
176 continue;
177 }
178
179 }
180
181 /* fill in the nss_domain_entry and add it to the
182 list of domains */
183
184 nss_domain = TALLOC_ZERO_P( nss_domain_list, struct nss_domain_entry );
185 if ( !nss_domain ) {
186 DEBUG(0,("nss_init: talloc() failure!\n"));
187 return NT_STATUS_NO_MEMORY;
188 }
189
190 nss_domain->backend = nss_backend;
191 nss_domain->domain = talloc_strdup( nss_domain, domain );
192
193 status = nss_domain->backend->methods->init( nss_domain );
194 if ( NT_STATUS_IS_OK( status ) ) {
195 DLIST_ADD( nss_domain_list, nss_domain );
196 } else {
197 DEBUG(0,("nss_init: Failed to init backend for %s domain!\n",
198 nss_domain->domain));
199 }
200
201 /* cleanup */
202
203 SAFE_FREE( backend );
204 SAFE_FREE( domain );
205 }
206
207 if ( !nss_domain_list ) {
208 DEBUG(3,("nss_init: no nss backends configured. "
209 "Defaulting to \"template\".\n"));
210
211
212 /* we shouild default to use template here */
213 }
214
215
216 nss_initialized = NT_STATUS_OK;
217
218 return NT_STATUS_OK;
219}
220
221/********************************************************************
222 *******************************************************************/
223
224static struct nss_domain_entry *find_nss_domain( const char *domain )
225{
226 NTSTATUS status;
227 struct nss_domain_entry *p;
228
229 status = nss_init( lp_winbind_nss_info() );
230 if ( !NT_STATUS_IS_OK(status) ) {
231 DEBUG(4,("nss_get_info: Failed to init nss_info API (%s)!\n",
232 nt_errstr(status)));
233 return NULL;
234 }
235
236 for ( p=nss_domain_list; p; p=p->next ) {
237 if ( strequal( p->domain, domain ) )
238 break;
239 }
240
241 /* If we didn't find a match, then use the default nss info */
242
243 if ( !p ) {
244 if ( !nss_domain_list ) {
245 return NULL;
246 }
247
248 p = nss_domain_list;
249 }
250
251 return p;
252}
253
254/********************************************************************
255 *******************************************************************/
256
257 NTSTATUS nss_get_info( const char *domain, const DOM_SID *user_sid,
258 TALLOC_CTX *ctx,
259 ADS_STRUCT *ads, LDAPMessage *msg,
260 char **homedir, char **shell, char **gecos,
261 gid_t *p_gid)
262{
263 struct nss_domain_entry *p;
264 struct nss_info_methods *m;
265
266 if ( (p = find_nss_domain( domain )) == NULL ) {
267 DEBUG(4,("nss_get_info: Failed to find nss domain pointer for %s\n",
268 domain ));
269 return NT_STATUS_NOT_FOUND;
270 }
271
272 m = p->backend->methods;
273
274 return m->get_nss_info( p, user_sid, ctx, ads, msg,
275 homedir, shell, gecos, p_gid );
276}
277
278/********************************************************************
279 *******************************************************************/
280
281 NTSTATUS nss_close( const char *parameters )
282{
283 struct nss_domain_entry *p = nss_domain_list;
284 struct nss_domain_entry *q;
285
286 while ( p && p->backend && p->backend->methods ) {
287 /* close the backend */
288 p->backend->methods->close_fn();
289
290 /* free the memory */
291 q = p;
292 p = p->next;
293 TALLOC_FREE( q );
294 }
295
296 return NT_STATUS_OK;
297}
298
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