6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * Copyright 2001 The FreeRADIUS server project
21 * Copyright 2001 Alan DeKok <aland@ox.org>
22 * Copyright 2001 Kostas Kalevras <kkalev@noc.ntua.gr>
27 #include "libradius.h"
40 #ifdef NEEDS_GDBM_SYNC
41 # define GDBM_SYNCOPT GDBM_SYNC
43 # define GDBM_SYNCOPT 0
47 static const char rcsid[] = "$Id$";
50 * Define a structure for our module configuration.
52 * These variables do not need to be in a structure, but it's
53 * a lot cleaner to do so, and a pointer to the structure can
54 * be used as the instance handle.
56 typedef struct rlm_counter_t {
57 char *filename; /* name of the database file */
58 char *reset; /* daily, weekly, monthly */
59 char *key_name; /* User-Name */
60 char *count_attribute; /* Acct-Session-Time */
61 char *counter_name; /* Daily-Session-Time */
62 char *check_name; /* Daily-Max-Session */
63 char *service_type; /* Service-Type to search for */
70 int dict_attr; /* attribute number for the counter. */
75 * A mapping of configuration file names to internal variables.
77 * Note that the string is dynamically allocated, so it MUST
78 * be freed. When the configuration file parse re-reads the string,
79 * it free's the old one, and strdup's the new one, placing the pointer
80 * to the strdup'd string into 'config.string'. This gets around
83 static CONF_PARSER module_config[] = {
84 { "filename", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,filename), NULL, NULL },
85 { "key", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,key_name), NULL, NULL },
86 { "reset", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,reset), NULL, NULL },
87 { "count-attribute", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,count_attribute), NULL, NULL },
88 { "counter-name", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,counter_name), NULL, NULL },
89 { "check-name", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,check_name), NULL, NULL },
90 { "allowed-servicetype", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,service_type),NULL, NULL },
91 { "cache-size", PW_TYPE_INTEGER, offsetof(rlm_counter_t,cache_size), NULL, "1000" },
92 { NULL, -1, 0, NULL, NULL }
97 * See if the counter matches.
99 static int counter_cmp(void *instance, VALUE_PAIR *request, VALUE_PAIR *check,
100 VALUE_PAIR *check_pairs, VALUE_PAIR **reply_pairs)
102 rlm_counter_t *data = (rlm_counter_t *) instance;
108 check_pairs = check_pairs; /* shut the compiler up */
109 reply_pairs = reply_pairs;
112 * Find the key attribute.
114 key_vp = pairfind(request, data->key_attr);
115 if (key_vp == NULL) {
116 return RLM_MODULE_NOOP;
119 key_datum.dptr = key_vp->strvalue;
120 key_datum.dsize = key_vp->length;
122 count_datum = gdbm_fetch(data->gdbm, key_datum);
123 if (count_datum.dptr == NULL) {
126 memcpy(&counter, count_datum.dptr, sizeof(int));
128 return counter - check->lvalue;
132 static int find_next_reset(rlm_counter_t *data, time_t timeval)
137 tm = localtime(&timeval);
138 tm->tm_sec = tm->tm_min = 0;
140 if (strcmp(data->reset, "hourly") == 0) {
142 * Round up to the next nearest hour.
145 data->reset_time = mktime(tm);
146 } else if (strcmp(data->reset, "daily") == 0) {
148 * Round up to the next nearest day.
152 data->reset_time = mktime(tm);
153 } else if (strcmp(data->reset, "weekly") == 0) {
155 * Round up to the next nearest week.
158 tm->tm_mday += (7 - tm->tm_wday);
159 data->reset_time = mktime(tm);
160 } else if (strcmp(data->reset, "monthly") == 0) {
164 data->reset_time = mktime(tm);
166 radlog(L_ERR, "rlm_counter: Unknown reset timer \"%s\"",
176 * Do any per-module initialization that is separate to each
177 * configured instance of the module. e.g. set up connections
178 * to external databases, read configuration files, set up
179 * dictionary entries, etc.
181 * If configuration information is given in the config section
182 * that must be referenced in later calls, store a handle to it
183 * in *instance otherwise put a null pointer there.
185 static int counter_instantiate(CONF_SECTION *conf, void **instance)
194 * Set up a storage area for instance data
196 data = rad_malloc(sizeof(*data));
199 * If the configuration parameters can't be parsed, then
202 if (cf_section_parse(conf, data, module_config) < 0) {
206 cache_size = data->cache_size;
209 * Discover the attribute number of the key.
211 if (data->key_name == NULL) {
212 radlog(L_ERR, "rlm_counter: 'key' must be set.");
215 dattr = dict_attrbyname(data->key_name);
217 radlog(L_ERR, "rlm_counter: No such attribute %s",
221 data->key_attr = dattr->attr;
224 * Discover the attribute number of the counter.
226 if (data->count_attribute == NULL) {
227 radlog(L_ERR, "rlm_counter: 'count-attribute' must be set.");
230 dattr = dict_attrbyname(data->count_attribute);
232 radlog(L_ERR, "rlm_counter: No such attribute %s",
233 data->count_attribute);
236 data->count_attr = dattr->attr;
239 * Create a new attribute for the counter.
241 if (data->counter_name == NULL) {
242 radlog(L_ERR, "rlm_counter: 'counter-name' must be set.");
245 dict_addattr(data->counter_name, 0, PW_TYPE_INTEGER, -1);
246 dattr = dict_attrbyname(data->counter_name);
248 radlog(L_ERR, "rlm_counter: Failed to create counter attribute %s",
252 data->dict_attr = dattr->attr;
253 DEBUG2("rlm_counter: Counter attribute %s is number %d",
254 data->counter_name, data->dict_attr);
257 * Create a new attribute for the check item.
259 if (data->check_name == NULL) {
260 radlog(L_ERR, "rlm_counter: 'check-name' must be set.");
263 dict_addattr(data->check_name, 0, PW_TYPE_INTEGER, -1);
264 dattr = dict_attrbyname(data->check_name);
266 radlog(L_ERR, "rlm_counter: Failed to create check attribute %s",
272 * Find the attribute for the allowed protocol
274 if (data->service_type == NULL) {
275 radlog(L_ERR, "rlm_counter: 'allowed-servicetype' must be set.");
278 if (data->service_type != NULL) {
279 if ((dval = dict_valbyname(PW_SERVICE_TYPE, data->service_type)) == NULL) {
280 radlog(L_ERR, "rlm_counter: Failed to find attribute number for %s",
284 data->service_val = dval->value;
288 * Discover when next to reset the database.
290 if (data->reset == NULL) {
291 radlog(L_ERR, "rlm_counter: 'reset' must be set.");
295 data->reset_time = 0;
297 if (find_next_reset(data,now) == -1)
299 DEBUG2("rlm_counter: Next reset %d", (int)data->reset_time);
301 if (data->filename == NULL) {
302 radlog(L_ERR, "rlm_counter: 'filename' must be set.");
305 data->gdbm = gdbm_open(data->filename, sizeof(int),
306 GDBM_WRCREAT | GDBM_SYNCOPT, 0600, NULL);
307 if (data->gdbm == NULL) {
308 radlog(L_ERR, "rlm_counter: Failed to open file %s: %s",
309 data->filename, strerror(errno));
312 if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
313 radlog(L_ERR, "rlm_counter: Failed to set cache size");
317 * Register the counter comparison operation.
319 paircompare_register(data->dict_attr, 0, counter_cmp, data);
327 * Write accounting information to this modules database.
329 static int counter_accounting(void *instance, REQUEST *request)
331 rlm_counter_t *data = (rlm_counter_t *)instance;
334 VALUE_PAIR *key_vp, *count_vp, *proto_vp;
340 * Before doing anything else, see if we have to reset
343 if (data->reset_time && (data->reset_time <= request->timestamp)) {
344 int cache_size = data->cache_size;
346 gdbm_close(data->gdbm);
349 * Re-set the next time to clean the database.
351 data->last_reset = data->reset_time;
352 find_next_reset(data,request->timestamp);
355 * Open a completely new database.
357 data->gdbm = gdbm_open(data->filename, sizeof(int),
358 GDBM_NEWDB | GDBM_SYNCOPT, 0600, NULL);
359 if (data->gdbm == NULL) {
360 radlog(L_ERR, "rlm_counter: Failed to open file %s: %s",
361 data->filename, strerror(errno));
362 return RLM_MODULE_FAIL;
364 if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
365 radlog(L_ERR, "rlm_counter: Failed to set cache size");
368 * Check if we need to watch out for a specific service-type. If yes then check it
370 if (data->service_type != NULL) {
371 if ((proto_vp = pairfind(request->packet->vps, PW_SERVICE_TYPE)) == NULL)
372 return RLM_MODULE_NOOP;
373 if (proto_vp->lvalue != data->service_val)
374 return RLM_MODULE_NOOP;
380 * Look for the key. User-Name is special. It means
381 * The REAL username, after stripping.
383 key_vp = (data->key_attr == PW_USER_NAME) ? request->username : pairfind(request->packet->vps, data->key_attr);
385 return RLM_MODULE_NOOP;
388 * Look for the attribute to use as a counter.
390 count_vp = pairfind(request->packet->vps, data->count_attr);
391 if (count_vp == NULL)
392 return RLM_MODULE_NOOP;
394 key_datum.dptr = key_vp->strvalue;
395 key_datum.dsize = key_vp->length;
397 count_datum = gdbm_fetch(data->gdbm, key_datum);
398 if (count_datum.dptr == NULL)
401 memcpy(&counter, count_datum.dptr, sizeof(int));
404 * if session time < diff then the user got in after the last reset. So add his session time
406 * That way if he logged in at 23:00 and we reset the daily counter at 24:00 and he logged out
407 * at 01:00 then we will only count one hour (the one in the new day). That is the right thing
410 diff = request->timestamp - data->last_reset;
411 counter += (count_vp->lvalue < diff) ? count_vp->lvalue : diff;
412 count_datum.dptr = (char *) &counter;
413 count_datum.dsize = sizeof(int);
415 rcode = gdbm_store(data->gdbm, key_datum, count_datum, GDBM_REPLACE);
417 radlog(L_ERR, "rlm_counter: Failed storing data to %s: %s",
418 data->filename, gdbm_strerror(gdbm_errno));
419 return RLM_MODULE_FAIL;
422 return RLM_MODULE_OK;
426 * Find the named user in this modules database. Create the set
427 * of attribute-value pairs to check and reply with for this user
428 * from the database. The authentication code only needs to check
429 * the password, the rest is done here.
431 static int counter_authorize(void *instance, REQUEST *request)
433 rlm_counter_t *data = (rlm_counter_t *) instance;
434 int ret=RLM_MODULE_NOOP;
440 VALUE_PAIR *key_vp, *check_vp;
441 VALUE_PAIR *reply_item;
444 /* quiet the compiler */
449 * Before doing anything else, see if we have to reset
452 if (data->reset_time && (data->reset_time <= request->timestamp)) {
453 int cache_size = data->cache_size;
455 gdbm_close(data->gdbm);
458 * Re-set the next time to clean the database.
460 data->last_reset = data->reset_time;
461 find_next_reset(data,request->timestamp);
464 * Open a completely new database.
466 data->gdbm = gdbm_open(data->filename, sizeof(int),
467 GDBM_NEWDB | GDBM_SYNCOPT, 0600, NULL);
468 if (data->gdbm == NULL) {
469 radlog(L_ERR, "rlm_counter: Failed to open file %s: %s",
470 data->filename, strerror(errno));
471 return RLM_MODULE_FAIL;
473 if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
474 radlog(L_ERR, "rlm_counter: Failed to set cache size");
479 * Look for the key. User-Name is special. It means
480 * The REAL username, after stripping.
482 DEBUG2("rlm_counter: Entering module authorize code");
483 key_vp = (data->key_attr == PW_USER_NAME) ? request->username : pairfind(request->packet->vps, data->key_attr);
484 if (key_vp == NULL) {
485 DEBUG2("rlm_counter: Could not find Key value pair");
490 * Look for the check item
493 if ((dattr = dict_attrbyname(data->check_name)) == NULL)
495 if ((check_vp= pairfind(request->config_items, dattr->attr)) == NULL) {
496 DEBUG2("rlm_counter: Could not find Check item value pair");
500 key_datum.dptr = key_vp->strvalue;
501 key_datum.dsize = key_vp->length;
503 count_datum = gdbm_fetch(data->gdbm, key_datum);
504 if (count_datum.dptr != NULL)
505 memcpy(&counter, count_datum.dptr, sizeof(int));
508 * Check if check item > counter
510 res=check_vp->lvalue - counter;
513 * We are assuming that simultaneous-use=1. But even if that does
514 * not happen then our user could login at max for 2*max-usage-time
515 * Is that acceptable?
519 * User is allowed, but set Session-Timeout.
520 * Stolen from main/auth.c
524 * If we are near a reset then add the next limit, so that the user will
525 * not need to login again
528 if (res >= (data->reset_time - request->timestamp))
529 res += check_vp->lvalue;
531 DEBUG2("rlm_counter: (Check item - counter) is greater than zero");
532 if ((reply_item = pairfind(request->reply->vps, PW_SESSION_TIMEOUT)) != NULL) {
533 if (reply_item->lvalue > res)
534 reply_item->lvalue = res;
536 if ((reply_item = paircreate(PW_SESSION_TIMEOUT, PW_TYPE_INTEGER)) == NULL) {
537 radlog(L_ERR|L_CONS, "no memory");
538 return RLM_MODULE_NOOP;
540 reply_item->lvalue = res;
541 pairadd(&request->reply->vps, reply_item);
546 DEBUG2("rlm_counter: Authorized user %s, check_item=%d, counter=%d",
547 key_vp->strvalue,check_vp->lvalue,counter);
548 DEBUG2("rlm_counter: Sent Reply-Item for user %s, Type=Session-Timeout, value=%d",
549 key_vp->strvalue,res);
553 * User is denied access, send back a reply message
555 sprintf(msg, "Your maximum %s usage time has been reached", data->reset);
556 reply_item=pairmake("Reply-Message", msg, T_OP_EQ);
557 pairadd(&request->reply->vps, reply_item);
559 ret=RLM_MODULE_REJECT;
561 DEBUG2("rlm_counter: Rejected user %s, check_item=%d, counter=%d",
562 key_vp->strvalue,check_vp->lvalue,counter);
568 static int counter_detach(void *instance)
570 rlm_counter_t *data = (rlm_counter_t *) instance;
572 paircompare_unregister(data->dict_attr, counter_cmp);
573 gdbm_close(data->gdbm);
574 free(data->filename);
576 free(data->key_name);
577 free(data->count_attribute);
578 free(data->counter_name);
585 * The module name should be the only globally exported symbol.
586 * That is, everything else should be 'static'.
588 * If the module needs to temporarily modify it's instantiation
589 * data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
590 * The server will then take care of ensuring that the module
591 * is single-threaded.
593 module_t rlm_counter = {
595 RLM_TYPE_THREAD_UNSAFE, /* type */
596 NULL, /* initialization */
597 counter_instantiate, /* instantiation */
599 NULL, /* authentication */
600 counter_authorize, /* authorization */
601 NULL, /* preaccounting */
602 counter_accounting, /* accounting */
603 NULL /* checksimul */
605 counter_detach, /* detach */