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/*
* rlm_dbm.c authorize: authorize using ndbm database
*
* Version: $Id: rlm_dbm.c,v 1.9 2004/02/26 19:04:28 aland Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copyright 2001 Koulik Andrei, Sandy Service
*/
#include <string.h>
#include <stdlib.h>
#ifdef HAVE_NDBM_H
#include <ndbm.h>
#endif
#ifdef HAVE_GDBM_NDBM_H
#include <gdbm/ndbm.h>
#endif
#ifdef HAVE_GDBMNDBM_H
#include <gdbm-ndbm.h>
#endif
#include <fcntl.h>
#include "libradius.h"
#include "radiusd.h"
#include "modules.h"
#ifdef SANDY_MOD
# include "sandymod.h"
#endif
static const char rcsid[] = "$Id: rlm_dbm.c,v 1.9 2004/02/26 19:04:28 aland Exp $";
#define MYDBM DBM
#define get_user_content dbm_fetch
#define SM_JOIN_ATTR 1029
#ifdef SANDY_MOD
# define SM_POOL_ATTR 510
#endif
typedef struct rlm_dbm_t {
#ifdef SANDY_MOD
char *dms_servers;
char *ducpd_servers;
#endif
char *userfile;
int findmod;
} rlm_dbm_t;
typedef struct user_entry {
char * username;
struct user_entry * next;
} SM_USER_ENTRY;
static CONF_PARSER module_config[] = {
{ "usersfile", PW_TYPE_STRING_PTR,offsetof(struct rlm_dbm_t,userfile),
NULL, "/etc/uf" },
{ NULL, -1, 0, NULL, NULL }
};
static void sm_user_list_wipe (SM_USER_ENTRY **ue) {
SM_USER_ENTRY * pue, *nue;
if ( ! *ue ) return ;
pue = *ue;
while ( pue != NULL ) {
nue = pue -> next;
DEBUG2("Remove %s from user list", pue -> username);
free(pue -> username);
free(pue);
pue = nue;
}
*ue = NULL;
}
/*
* add username un to user list ue;
* return 0 if user succefuly added
* 1 - if username already exists
* -1 - error: no memmory
*/
static int sm_user_list_add(SM_USER_ENTRY **ue, const char *un) {
while( *ue ) {
if ( strcmp( (*ue) -> username, un) == 0 ) return 1;
ue = & ((*ue) -> next);
}
*ue = malloc(sizeof(SM_USER_ENTRY));
if ( !*ue ) return -1;
(*ue) -> username = strdup(un);
DEBUG2("Add %s to user list", (*ue) -> username);
(*ue) -> next = NULL ;
if ( ! (*ue) -> username ) {
free(*ue);
*ue = NULL;
return -1;
} else return 0;
}
enum {
SMP_PATTERN,
SMP_REPLY,
SMP_ERROR
};
/******/
static int isfallthrough(VALUE_PAIR *vp) {
VALUE_PAIR * tmp;
tmp = pairfind(vp, PW_FALL_THROUGH);
return tmp ? tmp -> lvalue : 1; /* if no FALL_THROUGH - keep looking */
}
/* sm_parse_user
* find user, parse and return result
* in-parameters:
* pdb - ndbm handler
* username - user name from request
* request - pair originated from the nas
* mode - search mode SM_SM_ACCUM - accumulative search mode
* out-parameters:
* in-out:
* parsed_users - list of parsed user names for loop removal
*/
static int sm_parse_user(DBM *pdb, const char * username, VALUE_PAIR const* request, VALUE_PAIR **config,
VALUE_PAIR **reply, SM_USER_ENTRY **ulist)
{
datum k,d;
int retcod, found = RLM_MODULE_NOTFOUND, res ;
VALUE_PAIR *vp = NULL,* tmp_config = NULL, *tmp_reply = NULL, *nu_reply = NULL;
VALUE_PAIR *join_attr;
char *ch,*beg;
int parse_state = SMP_PATTERN;
int continue_search = 1;
/* check for loop */
DEBUG2("sm_parse_user.c: check for loops");
if ( (retcod = sm_user_list_add(ulist,username) ) ) {
if ( retcod < 0 ) radlog(L_ERR,"rlm_dbm: Couldn't allocate memory");
else radlog(L_ERR,"rlm_dbm: Invalid configuration: loop detected");
return RLM_MODULE_FAIL;
}
/* retrieve user content */
k.dptr = username;
k.dsize = strlen(username) + 1 ; /* username stored with '\0' */
d = dbm_fetch(pdb, k);
if ( d.dptr == NULL ) {
DEBUG2("rlm_dbm: User <%s> not foud in database\n",username);
return RLM_MODULE_NOTFOUND;
}
ch = d.dptr;
ch [ d.dsize - 1 ] = '\0'; /* should be closed by 0 */
DEBUG2("sm_parse_user: start parsing: user: %s", username);
/* start parse content */
while ( parse_state != SMP_ERROR && *ch && continue_search ) {
beg = ch;
while( *ch && *ch != '\n') ch++ ;
if ( *ch == '\n' ) { *ch = 0; ch++; }
DEBUG2("parse buffer: <<%s>>\n",beg);
retcod = userparse(beg,&vp);
if ( retcod == T_INVALID ) librad_perror("parse error ");
switch ( retcod ) {
case T_COMMA: break; /* continue parse the current list */
case T_EOL: DEBUG2("rlm_dbm: recod parsed\n"); /* vp contains full pair list */
if ( parse_state == SMP_PATTERN ) { /* pattern line found */
DEBUG2("process pattern");
/* check pattern against request */
if ( paircmp(NULL, request, vp, reply ) == 0 ) {
DEBUG2("rlm_dbm: Pattern matched, look for request");
pairmove(&tmp_config, &vp);
pairfree(&vp);
parse_state = SMP_REPLY; /* look for reply */
} else {
/* skip reply */
DEBUG2("rlm_dbm: patern not matched, reply skiped");
pairfree(&vp);
while ( *ch && *ch !='\n' ) ch++;
if ( *ch == '\n' ) ch++;
}
} else { /* reply line found */
/* look for join-attribute */
DEBUG2("rlm_dbm: Reply found");
join_attr = vp;
while( (join_attr = pairfind(join_attr,SM_JOIN_ATTR) ) != NULL ) {
DEBUG2("rlm_dbm: Proccess nested record: username %s",
(char *)join_attr->strvalue);
/* res = RLM_MODULE_NOTFOUND; */
res = sm_parse_user(pdb, (char *)join_attr->strvalue, request, &tmp_config,
&nu_reply, ulist);
DEBUG("rlm_dbm: recived: %d\n",res);
switch ( res ) {
case RLM_MODULE_NOTFOUND:
case RLM_MODULE_OK:
break;
default: /* seems error code */
parse_state = SMP_ERROR;
DEBUG2("rlm_dbm: Nested record error\n");
break;
}
join_attr = join_attr -> next;
}
pairdelete(&vp,SM_JOIN_ATTR);
if ( parse_state != SMP_ERROR ) {
if ( ! isfallthrough(vp) ) {
continue_search = 0;
DEBUG2("rlm_dbm: Break search due Fall-Through = no");
}
pairmove(&vp,&nu_reply);
pairfree(&nu_reply);
pairmove(&tmp_reply,&vp);
pairfree(&vp);
parse_state = SMP_PATTERN;
found = RLM_MODULE_OK;
}
pairfree(&vp);
pairfree(&nu_reply); }
break;
default: /* we do not wait that !!!! */
parse_state = SMP_ERROR;
DEBUG2("rlm_dbm: Unknown token: %d\n",retcod);
break;
}
}
if ( parse_state == SMP_PATTERN ) {
pairmove(config,&tmp_config);
pairfree(&tmp_config);
pairmove(reply,&tmp_reply);
pairfree(&tmp_reply);
} else {
pairfree(&tmp_config);
pairfree(&tmp_reply);
pairfree(&vp);
DEBUG2("rlm_dbm: Bad final parse state: %d\n",parse_state);
found = RLM_MODULE_FAIL ;
}
pairfree(&vp);
return found;
}
static int sm_postprocessor(VALUE_PAIR **reply UNUSED) {
return 0;
}
static int rlm_dbm_instantiate(CONF_SECTION *conf, void **instance) {
struct rlm_dbm_t *inst;
inst = rad_malloc(sizeof(rlm_dbm_t));
if (!inst) {
return -1;
}
memset(inst, 0, sizeof(*inst));
if (cf_section_parse(conf, inst, module_config) < 0) {
free(inst);
return -1;
}
*instance = inst;
return 0;
}
static int rlm_dbm_authorize(void *instance, REQUEST *request)
{
VALUE_PAIR *namepair;
VALUE_PAIR *request_pairs;
VALUE_PAIR *check_tmp = NULL;
VALUE_PAIR *reply_tmp = NULL;
int found = 0;
const char *name;
SM_USER_ENTRY *ulist = NULL;
DBM *pdb;
struct rlm_dbm_t *inst = instance;
VALUE_PAIR **check_pairs, **reply_pairs;
request_pairs = request->packet->vps;
check_pairs = &request->config_items;
reply_pairs = &request->reply->vps;
/*
* Grab the canonical user name.
*/
namepair = request->username;
name = namepair ? (char *) namepair->strvalue : "NONE";
DEBUG2("rlm_dbm: try open database file: %s\n",inst -> userfile);
/* open database */
if ( ( pdb = dbm_open(inst->userfile, O_RDONLY, 0600) ) != NULL ) {
DEBUG("rlm_dbm: Call parse_user:\n");
found = sm_parse_user(pdb, name, request_pairs, &check_tmp, &reply_tmp, &ulist);
if ( found == RLM_MODULE_NOTFOUND ) {
sm_user_list_wipe(&ulist);
found = sm_parse_user(pdb, "DEFAULT", request_pairs, &check_tmp, &reply_tmp, &ulist);
}
dbm_close(pdb);
} else {
found = RLM_MODULE_FAIL;
DEBUG2("rlm_dbm: Cannot open database file: %s\n",
strerror(errno));
}
if ( found == RLM_MODULE_OK ) {
/* do preprocessor for final reply-pair tranformation */
if ( !sm_postprocessor(&reply_tmp) ) {
pairmove(reply_pairs, &reply_tmp);
pairmove(check_pairs, &check_tmp);
} else found = RLM_MODULE_FAIL;
}
sm_user_list_wipe(&ulist);
pairfree(&reply_tmp);
pairfree(&check_tmp);
return found;
}
static int rlm_dbm_detach(void *instance)
{
struct rlm_dbm_t *inst = instance;
free(inst -> userfile);
free(inst);
return 0;
}
/* globally exported name */
module_t rlm_dbm = {
"dbm",
0, /* type: reserved */
NULL, /* initialization */
rlm_dbm_instantiate, /* instantiation */
{
NULL, /* authentication */
rlm_dbm_authorize, /* authorization */
NULL, /* preaccounting */
NULL, /* accounting */
NULL, /* checksimul */
NULL, /* pre-proxy */
NULL, /* post-proxy */
NULL /* post-auth */
},
rlm_dbm_detach, /* detach */
NULL /* destroy */
};
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