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/*
Unix SMB/CIFS implementation.
Idmap NSS headers
Copyright (C) Gerald Carter 2006
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_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, 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(0,("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( const char *config, char **backend, char **domain )
{
char *p;
char *q;
int len;
*backend = *domain = NULL;
if ( !config )
return False;
p = strchr( config, ':' );
/* if no : then the string must be the backend name only */
if ( !p ) {
*backend = SMB_STRDUP( config );
return (*backend != NULL);
}
/* split the string and return the two parts */
if ( strlen(p+1) > 0 ) {
*domain = SMB_STRDUP( p+1 );
}
len = PTR_DIFF(p,config)+1;
if ( (q = SMB_MALLOC_ARRAY( char, len )) == NULL ) {
SAFE_FREE( *backend );
return False;
}
StrnCpy( q, config, len-1);
q[len-1] = '\0';
*backend = q;
return True;
}
/********************************************************************
Each nss backend must not store global state, but rather be able
to initialize the state on a per domain basis.
*******************************************************************/
NTSTATUS nss_init( const char **nss_list )
{
NTSTATUS status;
static NTSTATUS nss_initialized = NT_STATUS_UNSUCCESSFUL;
int i;
char *backend, *domain;
struct nss_function_entry *nss_backend;
struct nss_domain_entry *nss_domain;
/* check for previous successful initializations */
if ( NT_STATUS_IS_OK(nss_initialized) )
return NT_STATUS_OK;
/* The "template" backend should alqays be registered as it
is a static module */
if ( (nss_backend = nss_get_backend( "template" )) == NULL ) {
static_init_nss_info;
}
/* Create the list of nss_domains (loading any shared plugins
as necessary) */
for ( i=0; nss_list && nss_list[i]; i++ ) {
if ( !parse_nss_parm(nss_list[i], &backend, &domain) ) {
DEBUG(0,("nss_init: failed to parse \"%s\"!\n",
nss_list[i]));
continue;
}
/* validate the backend */
if ( (nss_backend = nss_get_backend( backend )) == NULL ) {
/* attempt to register the backend */
status = smb_probe_module( "nss_info", backend );
if ( !NT_STATUS_IS_OK(status) ) {
continue;
}
/* try again */
if ( (nss_backend = nss_get_backend( backend )) == NULL ) {
DEBUG(0,("nss_init: unregistered backend %s!. Skipping\n",
backend));
continue;
}
}
/* fill in the nss_domain_entry and add it to the
list of domains */
nss_domain = TALLOC_ZERO_P( nss_domain_list, struct nss_domain_entry );
if ( !nss_domain ) {
DEBUG(0,("nss_init: talloc() failure!\n"));
return NT_STATUS_NO_MEMORY;
}
nss_domain->backend = nss_backend;
nss_domain->domain = talloc_strdup( nss_domain, domain );
/* Try to init and ave the result */
nss_domain->init_status = nss_domain->backend->methods->init( nss_domain );
DLIST_ADD( nss_domain_list, nss_domain );
if ( !NT_STATUS_IS_OK(nss_domain->init_status) ) {
DEBUG(0,("nss_init: Failed to init backend for %s domain!\n",
nss_domain->domain));
}
/* cleanup */
SAFE_FREE( backend );
SAFE_FREE( domain );
}
if ( !nss_domain_list ) {
DEBUG(3,("nss_init: no nss backends configured. "
"Defaulting to \"template\".\n"));
/* we shouild default to use template here */
}
nss_initialized = NT_STATUS_OK;
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,("nss_get_info: 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 info */
if ( !p ) {
if ( !nss_domain_list ) {
return NULL;
}
p = nss_domain_list;
}
if ( !NT_STATUS_IS_OK( p->init_status ) ) {
p->init_status = p->backend->methods->init( p );
}
return p;
}
/********************************************************************
*******************************************************************/
NTSTATUS nss_get_info( const char *domain, const DOM_SID *user_sid,
TALLOC_CTX *ctx,
ADS_STRUCT *ads, LDAPMessage *msg,
char **homedir, char **shell, char **gecos,
gid_t *p_gid)
{
struct nss_domain_entry *p;
struct nss_info_methods *m;
if ( (p = find_nss_domain( domain )) == NULL ) {
DEBUG(4,("nss_get_info: Failed to find nss domain pointer for %s\n",
domain ));
return NT_STATUS_NOT_FOUND;
}
m = p->backend->methods;
return m->get_nss_info( p, user_sid, ctx, ads, msg,
homedir, shell, gecos, p_gid );
}
/********************************************************************
*******************************************************************/
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;
}
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