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/*
netgroup.c - NSS lookup functions for netgroup entries
Copyright (C) 2006 West Consulting
Copyright (C) 2006, 2007, 2008, 2010 Arthur de Jong
Copyright (C) 2010 Symas Corporation
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 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "prototypes.h"
#include "common.h"
#include "compat/attrs.h"
/* we redefine this here because we need to return NSS_STATUS_RETURN
instead of NSS_STATUS_NOTFOUND */
#undef ERROR_OUT_NOSUCCESS
#define ERROR_OUT_NOSUCCESS(fp) \
(void)tio_close(fp); \
fp=NULL; \
return NSS_STATUS_RETURN;
/* function for reading a single result entry */
static nss_status_t read_netgrent(
TFILE *fp,struct __netgrent *result,
char *buffer,size_t buflen,int *errnop)
{
int32_t tmpint32;
int type;
size_t bufptr=0;
/* read netgroup type */
READ_INT32(fp,type);
if (type==NSLCD_NETGROUP_TYPE_NETGROUP)
{
/* the response is a reference to another netgroup */
result->type=group_val;
READ_BUF_STRING(fp,result->val.group);
}
else if (type==NSLCD_NETGROUP_TYPE_TRIPLE)
{
/* the response is a host/user/domain triple */
result->type=triple_val;
/* read host and revert to NULL on empty string */
READ_BUF_STRING(fp,result->val.triple.host);
if (result->val.triple.host[0]=='\0')
{
result->val.triple.host=NULL;
bufptr--; /* free unused space */
}
/* read user and revert to NULL on empty string */
READ_BUF_STRING(fp,result->val.triple.user);
if (result->val.triple.user[0]=='\0')
{
result->val.triple.user=NULL;
bufptr--; /* free unused space */
}
/* read domain and revert to NULL on empty string */
READ_BUF_STRING(fp,result->val.triple.domain);
if (result->val.triple.domain[0]=='\0')
{
result->val.triple.domain=NULL;
bufptr--; /* free unused space */
}
}
else
return NSS_STATUS_UNAVAIL;
/* we're done */
return NSS_STATUS_SUCCESS;
}
#ifdef NSS_FLAVOUR_GLIBC
/* thread-local file pointer to an ongoing request */
static __thread TFILE *netgrentfp;
/* start a request to get a netgroup by name */
nss_status_t _nss_ldap_setnetgrent(
const char *group,struct __netgrent UNUSED(*result))
{
/* we cannot use NSS_SETENT() here because we have a parameter that is only
available in this function */
int32_t tmpint32;
int errnocp;
int *errnop;
if (!_nss_ldap_enablelookups)
return NSS_STATUS_UNAVAIL;
errnop=&errnocp;
/* check parameter */
if ((group==NULL)||(group[0]=='\0'))
return NSS_STATUS_UNAVAIL;
/* open a new stream and write the request */
NSLCD_REQUEST(netgrentfp,NSLCD_ACTION_NETGROUP_BYNAME,WRITE_STRING(netgrentfp,group));
return NSS_STATUS_SUCCESS;
}
/* get a single netgroup tuple from the stream */
nss_status_t _nss_ldap_getnetgrent_r(
struct __netgrent *result,
char *buffer,size_t buflen,int *errnop)
{
NSS_GETENT(netgrentfp,NSLCD_ACTION_NETGROUP_BYNAME,buffer,buflen,
read_netgrent(netgrentfp,result,buffer,buflen,errnop));
return retv;
}
/* close the stream opened with setnetgrent() above */
nss_status_t _nss_ldap_endnetgrent(struct __netgrent UNUSED(*result))
{
NSS_ENDENT(netgrentfp);
}
#endif /* NSS_FLAVOUR_GLIBC */
#ifdef NSS_FLAVOUR_SOLARIS
/*
*thread specific context: result chain,and state data
*/
struct ent_context
{
void *first_entry;
void *curr_entry;
};
typedef struct ent_context ent_context_t;
struct nss_ldap_netgr_backend
{
nss_backend_op_t *ops;
int n_ops;
ent_context_t *state;
struct name_list *known_groups; /* netgroups seen, for loop detection */
struct name_list *needed_groups; /* nested netgroups to chase */
};
typedef struct nss_ldap_netgr_backend nss_ldap_netgr_backend_t;
static nss_status_t _xnss_ldap_setnetgrent(nss_backend_t UNUSED(*be),void UNUSED(*args))
{
return NSS_STATUS_SUCCESS;
}
/* find a netgroup that has not been traversed */
static char *_nss_ldap_chase_netgroup(nss_ldap_netgr_backend_t *ngbe)
{
nss_status_t status;
char *group=NULL;
int found=0;
if (!ngbe->needed_groups)
{
/* exhausted all netgroups */
return NULL;
}
while (ngbe->needed_groups&&!found)
{
if (_nss_ldap_namelist_find(ngbe->known_groups,
ngbe->needed_groups->name))
{
/* netgroup seen before,ignore it */
_nss_ldap_namelist_pop(&ngbe->needed_groups);
}
else
found=1;
}
if (found)
{
group=strdup(ngbe->needed_groups->name);
status=_nss_ldap_namelist_push(&ngbe->known_groups,
ngbe->needed_groups->name);
_nss_ldap_namelist_pop(&ngbe->needed_groups);
}
return group;
}
/* thread-local file pointer to an ongoing request */
static __thread TFILE *netgrentfp;
static nss_status_t _nss_nslcd_getnetgrent_r(struct __netgrent *result,char *buffer,size_t buflen,int *errnop)
{
NSS_GETENT(netgrentfp,NSLCD_ACTION_NETGROUP_BYNAME,buffer,buflen,
read_netgrent(netgrentfp,result,buffer,buflen,errnop));
return retv;
}
static nss_status_t _nss_nslcd_setnetgrent(const char *group,struct __netgrent UNUSED(*result))
{
/* we cannot use NSS_SETENT() here because we have a parameter that is only
available in this function */
int32_t tmpint32;
int errnocp;
int *errnop;
if (!_nss_ldap_enablelookups)
return NSS_STATUS_UNAVAIL;
errnop=&errnocp;
/* check parameter */
if ((group==NULL)||(group[0]=='\0'))
return NSS_STATUS_UNAVAIL;
/* open a new stream and write the request */
NSLCD_REQUEST(netgrentfp,NSLCD_ACTION_NETGROUP_BYNAME,WRITE_STRING(netgrentfp,group));
return NSS_STATUS_SUCCESS;
}
static nss_status_t _xnss_ldap_getnetgrent_r(nss_backend_t *_be,void *_args)
{
nss_ldap_netgr_backend_t *ngbe=(nss_ldap_netgr_backend_t *)_be;
struct nss_getnetgrent_args *args=(struct nss_getnetgrent_args *)_args;
struct __netgrent result;
char *group=NULL;
int done=0;
int err;
nss_status_t status,rc;
args->status=NSS_NETGR_NO;
while (!done)
{
status=_nss_nslcd_getnetgrent_r(&result,args->buffer,args->buflen,&err);
if (status!=NSS_STATUS_SUCCESS)
{
if (err==ENOENT)
{
/* done with the current netgroup */
/* explore nested netgroup,if any */
int found=0;
while (!found)
{
/* find a nested netgroup to pursue further */
group=_nss_ldap_chase_netgroup(ngbe);
if (!group)
{
/* no more netgroup */
found=1; done = 1;
errno=ENOENT;
}
else
{
rc=_nss_nslcd_setnetgrent(group,&result);
if (rc==NSS_STATUS_SUCCESS)
found=1;
free(group);
group=NULL;
}
} /* while !found */
}
else
{ /* err!=ENOENT */
done=1;
}
}
else
{ /* status==NSS_STATUS_SUCCESS */
if (result.type==group_val)
{
/* a netgroup nested within the current netgroup */
rc=_nss_ldap_namelist_push(&ngbe->needed_groups,result.val.group);
if (rc!=NSS_STATUS_SUCCESS)
{
/* unable to push the group name for later netgroup */
}
}
else if (result.type==triple_val)
{
args->retp[NSS_NETGR_MACHINE]=result.val.triple.host;
args->retp[NSS_NETGR_USER]=result.val.triple.user;
args->retp[NSS_NETGR_DOMAIN]=result.val.triple.domain;
args->status=NSS_NETGR_FOUND;
done=1;
}
else
{
/* NSS_STATUS_SUCCESS,but type is not group_val or triple_val */
/* should not be here,log a message */
status=NSS_STATUS_NOTFOUND;
done=1;
}
}
} /* while !done */
return status;
}
static nss_status_t _xnss_ldap_endnetgrent(nss_backend_t UNUSED(*be),void UNUSED(*args))
{
NSS_ENDENT(netgrentfp);
}
static nss_status_t _xnss_ldap_netgroup_destr(nss_backend_t *be,void UNUSED(*args))
{
nss_ldap_netgr_backend_t *ngbe=(nss_ldap_netgr_backend_t *)be;
/* free list of nested netgroups */
_nss_ldap_namelist_destroy(&ngbe->known_groups);
_nss_ldap_namelist_destroy(&ngbe->needed_groups);
free(ngbe);
return NSS_STATUS_SUCCESS;
}
static nss_status_t _xnss_ldap_netgr_set(nss_backend_t *be,void *_args);
static nss_backend_op_t netgroup_ops[]={
_xnss_ldap_netgroup_destr, /* NSS_DBOP_DESTRUCTOR */
_xnss_ldap_endnetgrent, /* NSS_DBOP_ENDENT */
_xnss_ldap_setnetgrent, /* NSS_DBOP_SETNET */
_xnss_ldap_getnetgrent_r, /* NSS_DBOP_GETENT */
NULL,/* TODO:_nss_ldap_netgr_in,*/ /* NSS_DBOP_NETGROUP_IN */
_xnss_ldap_netgr_set /* NSS_DBOP_NETGROUP_SET */
};
static nss_status_t _xnss_ldap_netgr_set(nss_backend_t *be,void *_args)
{
nss_status_t stat;
struct nss_setnetgrent_args *args;
nss_ldap_netgr_backend_t *ngbe;
struct __netgrent result;
char *group=NULL;
args=(struct nss_setnetgrent_args *)_args;
args->iterator=NULL; /* initialize */
ngbe=(nss_ldap_netgr_backend_t *)malloc(sizeof(*ngbe));
if (ngbe==NULL)
return NSS_STATUS_UNAVAIL;
ngbe->ops=netgroup_ops;
ngbe->n_ops=6;
ngbe->state=NULL;
ngbe->known_groups=NULL;
ngbe->needed_groups=NULL;
group=(char *)args->netgroup;
stat=_nss_nslcd_setnetgrent(group,&result);
if (stat!=NSS_STATUS_SUCCESS)
{
free(be);
return stat;
}
/* place the group name in known list */
stat=_nss_ldap_namelist_push(&ngbe->known_groups,group);
if (stat!=NSS_STATUS_SUCCESS)
{
_xnss_ldap_netgroup_destr((nss_backend_t *)ngbe,NULL);
return stat;
}
args->iterator=(nss_backend_t *)ngbe;
return stat;
}
nss_backend_t *_nss_ldap_netgroup_constr(const char UNUSED(*db_name),
const char UNUSED(*src_name),const char UNUSED(*cfg_args))
{
nss_ldap_netgr_backend_t *be;
if (!(be=(nss_ldap_netgr_backend_t *)malloc(sizeof(*be))))
return NULL;
be->ops=netgroup_ops;
be->n_ops=sizeof(netgroup_ops)/sizeof(nss_backend_op_t);
be->known_groups=NULL;
be->needed_groups=NULL;
return (nss_backend_t *)be;
}
#endif /* NSS_FLAVOUR_SOLARIS */
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