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"
41 #ifdef NEEDS_GDBM_SYNC
42 # define GDBM_SYNCOPT GDBM_SYNC
44 # define GDBM_SYNCOPT 0
48 static const char rcsid[] = "$Id$";
51 * Define a structure for our module configuration.
53 * These variables do not need to be in a structure, but it's
54 * a lot cleaner to do so, and a pointer to the structure can
55 * be used as the instance handle.
57 typedef struct rlm_counter_t {
58 char *filename; /* name of the database file */
59 char *reset; /* daily, weekly, monthly, never or user defined */
60 char *key_name; /* User-Name */
61 char *count_attribute; /* Acct-Session-Time */
62 char *counter_name; /* Daily-Session-Time */
63 char *check_name; /* Daily-Max-Session */
64 char *service_type; /* Service-Type to search for */
71 int dict_attr; /* attribute number for the counter. */
76 * A mapping of configuration file names to internal variables.
78 * Note that the string is dynamically allocated, so it MUST
79 * be freed. When the configuration file parse re-reads the string,
80 * it free's the old one, and strdup's the new one, placing the pointer
81 * to the strdup'd string into 'config.string'. This gets around
84 static CONF_PARSER module_config[] = {
85 { "filename", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,filename), NULL, NULL },
86 { "key", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,key_name), NULL, NULL },
87 { "reset", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,reset), NULL, NULL },
88 { "count-attribute", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,count_attribute), NULL, NULL },
89 { "counter-name", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,counter_name), NULL, NULL },
90 { "check-name", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,check_name), NULL, NULL },
91 { "allowed-servicetype", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,service_type),NULL, NULL },
92 { "cache-size", PW_TYPE_INTEGER, offsetof(rlm_counter_t,cache_size), NULL, "1000" },
93 { NULL, -1, 0, NULL, NULL }
98 * See if the counter matches.
100 static int counter_cmp(void *instance, REQUEST *req, VALUE_PAIR *request, VALUE_PAIR *check,
101 VALUE_PAIR *check_pairs, VALUE_PAIR **reply_pairs)
103 rlm_counter_t *data = (rlm_counter_t *) instance;
109 check_pairs = check_pairs; /* shut the compiler up */
110 reply_pairs = reply_pairs;
113 * Find the key attribute.
115 key_vp = pairfind(request, data->key_attr);
116 if (key_vp == NULL) {
117 return RLM_MODULE_NOOP;
120 key_datum.dptr = key_vp->strvalue;
121 key_datum.dsize = key_vp->length;
123 count_datum = gdbm_fetch(data->gdbm, key_datum);
124 if (count_datum.dptr == NULL) {
127 memcpy(&counter, count_datum.dptr, sizeof(int));
128 free(count_datum.dptr);
130 return counter - check->lvalue;
134 static int find_next_reset(rlm_counter_t *data, time_t timeval)
141 tm = localtime(&timeval);
142 tm->tm_sec = tm->tm_min = 0;
144 if (data->reset == NULL)
146 if (isdigit(data->reset[0])){
149 len = strlen(data->reset);
152 last = data->reset[len - 1];
155 num = atoi(data->reset);
156 DEBUG("rlm_counter: num=%d, last=%c",num,last);
158 if (strcmp(data->reset, "hourly") == 0 || last == 'h') {
160 * Round up to the next nearest hour.
163 data->reset_time = mktime(tm);
164 } else if (strcmp(data->reset, "daily") == 0 || last == 'd') {
166 * Round up to the next nearest day.
170 data->reset_time = mktime(tm);
171 } else if (strcmp(data->reset, "weekly") == 0 || last == 'w') {
173 * Round up to the next nearest week.
176 tm->tm_mday += (7 - tm->tm_wday) +(7*(num-1));
177 data->reset_time = mktime(tm);
178 } else if (strcmp(data->reset, "monthly") == 0 || last == 'm') {
182 data->reset_time = mktime(tm);
183 } else if (strcmp(data->reset, "never") == 0) {
184 data->reset_time = 0;
186 radlog(L_ERR, "rlm_counter: Unknown reset timer \"%s\"",
190 DEBUG2("rlm_counter: Current Time: %d, Next reset %d",
191 (int)timeval,(int)data->reset_time);
198 * Do any per-module initialization that is separate to each
199 * configured instance of the module. e.g. set up connections
200 * to external databases, read configuration files, set up
201 * dictionary entries, etc.
203 * If configuration information is given in the config section
204 * that must be referenced in later calls, store a handle to it
205 * in *instance otherwise put a null pointer there.
207 static int counter_instantiate(CONF_SECTION *conf, void **instance)
217 * Set up a storage area for instance data
219 data = rad_malloc(sizeof(*data));
222 * If the configuration parameters can't be parsed, then
225 if (cf_section_parse(conf, data, module_config) < 0) {
229 cache_size = data->cache_size;
232 * Discover the attribute number of the key.
234 if (data->key_name == NULL) {
235 radlog(L_ERR, "rlm_counter: 'key' must be set.");
238 dattr = dict_attrbyname(data->key_name);
240 radlog(L_ERR, "rlm_counter: No such attribute %s",
244 data->key_attr = dattr->attr;
247 * Discover the attribute number of the counter.
249 if (data->count_attribute == NULL) {
250 radlog(L_ERR, "rlm_counter: 'count-attribute' must be set.");
253 dattr = dict_attrbyname(data->count_attribute);
255 radlog(L_ERR, "rlm_counter: No such attribute %s",
256 data->count_attribute);
259 data->count_attr = dattr->attr;
262 * Create a new attribute for the counter.
264 if (data->counter_name == NULL) {
265 radlog(L_ERR, "rlm_counter: 'counter-name' must be set.");
269 memset(&flags, 0, sizeof(flags));
270 dict_addattr(data->counter_name, 0, PW_TYPE_INTEGER, -1, flags);
271 dattr = dict_attrbyname(data->counter_name);
273 radlog(L_ERR, "rlm_counter: Failed to create counter attribute %s",
277 data->dict_attr = dattr->attr;
278 DEBUG2("rlm_counter: Counter attribute %s is number %d",
279 data->counter_name, data->dict_attr);
282 * Create a new attribute for the check item.
284 if (data->check_name == NULL) {
285 radlog(L_ERR, "rlm_counter: 'check-name' must be set.");
288 dict_addattr(data->check_name, 0, PW_TYPE_INTEGER, -1, flags);
289 dattr = dict_attrbyname(data->check_name);
291 radlog(L_ERR, "rlm_counter: Failed to create check attribute %s",
297 * Find the attribute for the allowed protocol
299 if (data->service_type != NULL) {
300 if ((dval = dict_valbyname(PW_SERVICE_TYPE, data->service_type)) == NULL) {
301 radlog(L_ERR, "rlm_counter: Failed to find attribute number for %s",
305 data->service_val = dval->value;
309 * Discover when next to reset the database.
311 if (data->reset == NULL) {
312 radlog(L_ERR, "rlm_counter: 'reset' must be set.");
316 data->reset_time = 0;
318 if (find_next_reset(data,now) == -1)
321 if (data->filename == NULL) {
322 radlog(L_ERR, "rlm_counter: 'filename' must be set.");
325 data->gdbm = gdbm_open(data->filename, sizeof(int),
326 GDBM_WRCREAT | GDBM_SYNCOPT, 0600, NULL);
327 if (data->gdbm == NULL) {
328 radlog(L_ERR, "rlm_counter: Failed to open file %s: %s",
329 data->filename, strerror(errno));
332 if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
333 radlog(L_ERR, "rlm_counter: Failed to set cache size");
337 * Register the counter comparison operation.
339 paircompare_register(data->dict_attr, 0, counter_cmp, data);
347 * Write accounting information to this modules database.
349 static int counter_accounting(void *instance, REQUEST *request)
351 rlm_counter_t *data = (rlm_counter_t *)instance;
354 VALUE_PAIR *key_vp, *count_vp, *proto_vp;
360 * Before doing anything else, see if we have to reset
363 if (data->reset_time && (data->reset_time <= request->timestamp)) {
364 int cache_size = data->cache_size;
366 gdbm_close(data->gdbm);
369 * Re-set the next time to clean the database.
371 data->last_reset = data->reset_time;
372 find_next_reset(data,request->timestamp);
375 * Open a completely new database.
377 data->gdbm = gdbm_open(data->filename, sizeof(int),
378 GDBM_NEWDB | GDBM_SYNCOPT, 0600, NULL);
379 if (data->gdbm == NULL) {
380 radlog(L_ERR, "rlm_counter: Failed to open file %s: %s",
381 data->filename, strerror(errno));
382 return RLM_MODULE_FAIL;
384 if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
385 radlog(L_ERR, "rlm_counter: Failed to set cache size");
388 * Check if we need to watch out for a specific service-type. If yes then check it
390 if (data->service_type != NULL) {
391 if ((proto_vp = pairfind(request->packet->vps, PW_SERVICE_TYPE)) == NULL)
392 return RLM_MODULE_NOOP;
393 if (proto_vp->lvalue != data->service_val)
394 return RLM_MODULE_NOOP;
400 * Look for the key. User-Name is special. It means
401 * The REAL username, after stripping.
403 key_vp = (data->key_attr == PW_USER_NAME) ? request->username : pairfind(request->packet->vps, data->key_attr);
405 return RLM_MODULE_NOOP;
408 * Look for the attribute to use as a counter.
410 count_vp = pairfind(request->packet->vps, data->count_attr);
411 if (count_vp == NULL)
412 return RLM_MODULE_NOOP;
414 key_datum.dptr = key_vp->strvalue;
415 key_datum.dsize = key_vp->length;
417 count_datum = gdbm_fetch(data->gdbm, key_datum);
418 if (count_datum.dptr == NULL)
421 memcpy(&counter, count_datum.dptr, sizeof(int));
422 free(count_datum.dptr);
426 * if session time < diff then the user got in after the last reset. So add his session time
428 * That way if he logged in at 23:00 and we reset the daily counter at 24:00 and he logged out
429 * at 01:00 then we will only count one hour (the one in the new day). That is the right thing
432 diff = request->timestamp - data->last_reset;
433 counter += (count_vp->lvalue < diff) ? count_vp->lvalue : diff;
434 count_datum.dptr = (char *) &counter;
435 count_datum.dsize = sizeof(int);
437 rcode = gdbm_store(data->gdbm, key_datum, count_datum, GDBM_REPLACE);
439 radlog(L_ERR, "rlm_counter: Failed storing data to %s: %s",
440 data->filename, gdbm_strerror(gdbm_errno));
441 return RLM_MODULE_FAIL;
444 return RLM_MODULE_OK;
448 * Find the named user in this modules database. Create the set
449 * of attribute-value pairs to check and reply with for this user
450 * from the database. The authentication code only needs to check
451 * the password, the rest is done here.
453 static int counter_authorize(void *instance, REQUEST *request)
455 rlm_counter_t *data = (rlm_counter_t *) instance;
456 int ret=RLM_MODULE_NOOP;
462 VALUE_PAIR *key_vp, *check_vp;
463 VALUE_PAIR *reply_item;
466 /* quiet the compiler */
471 * Before doing anything else, see if we have to reset
474 if (data->reset_time && (data->reset_time <= request->timestamp)) {
475 int cache_size = data->cache_size;
477 gdbm_close(data->gdbm);
480 * Re-set the next time to clean the database.
482 data->last_reset = data->reset_time;
483 find_next_reset(data,request->timestamp);
486 * Open a completely new database.
488 data->gdbm = gdbm_open(data->filename, sizeof(int),
489 GDBM_NEWDB | GDBM_SYNCOPT, 0600, NULL);
490 if (data->gdbm == NULL) {
491 radlog(L_ERR, "rlm_counter: Failed to open file %s: %s",
492 data->filename, strerror(errno));
493 return RLM_MODULE_FAIL;
495 if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
496 radlog(L_ERR, "rlm_counter: Failed to set cache size");
501 * Look for the key. User-Name is special. It means
502 * The REAL username, after stripping.
504 DEBUG2("rlm_counter: Entering module authorize code");
505 key_vp = (data->key_attr == PW_USER_NAME) ? request->username : pairfind(request->packet->vps, data->key_attr);
506 if (key_vp == NULL) {
507 DEBUG2("rlm_counter: Could not find Key value pair");
512 * Look for the check item
515 if ((dattr = dict_attrbyname(data->check_name)) == NULL)
517 if ((check_vp= pairfind(request->config_items, dattr->attr)) == NULL) {
518 DEBUG2("rlm_counter: Could not find Check item value pair");
522 key_datum.dptr = key_vp->strvalue;
523 key_datum.dsize = key_vp->length;
525 count_datum = gdbm_fetch(data->gdbm, key_datum);
526 if (count_datum.dptr != NULL){
527 memcpy(&counter, count_datum.dptr, sizeof(int));
528 free(count_datum.dptr);
533 * Check if check item > counter
535 res=check_vp->lvalue - counter;
538 * We are assuming that simultaneous-use=1. But even if that does
539 * not happen then our user could login at max for 2*max-usage-time
540 * Is that acceptable?
544 * User is allowed, but set Session-Timeout.
545 * Stolen from main/auth.c
549 * If we are near a reset then add the next limit, so that the user will
550 * not need to login again
553 if (data->reset_time && res >= (data->reset_time - request->timestamp))
554 res += check_vp->lvalue;
556 DEBUG2("rlm_counter: (Check item - counter) is greater than zero");
557 if ((reply_item = pairfind(request->reply->vps, PW_SESSION_TIMEOUT)) != NULL) {
558 if (reply_item->lvalue > res)
559 reply_item->lvalue = res;
561 if ((reply_item = paircreate(PW_SESSION_TIMEOUT, PW_TYPE_INTEGER)) == NULL) {
562 radlog(L_ERR|L_CONS, "no memory");
563 return RLM_MODULE_NOOP;
565 reply_item->lvalue = res;
566 pairadd(&request->reply->vps, reply_item);
571 DEBUG2("rlm_counter: Authorized user %s, check_item=%d, counter=%d",
572 key_vp->strvalue,check_vp->lvalue,counter);
573 DEBUG2("rlm_counter: Sent Reply-Item for user %s, Type=Session-Timeout, value=%d",
574 key_vp->strvalue,res);
577 char module_msg[MAX_STRING_LEN];
578 VALUE_PAIR *module_msg_vp;
581 * User is denied access, send back a reply message
583 sprintf(msg, "Your maximum %s usage time has been reached", data->reset);
584 reply_item=pairmake("Reply-Message", msg, T_OP_EQ);
585 pairadd(&request->reply->vps, reply_item);
587 snprintf(module_msg, sizeof(module_msg), "rlm_counter: Maximum %s usage time reached", data->reset);
588 module_msg_vp = pairmake("Module-Message", module_msg, T_OP_EQ);
589 pairadd(&request->packet->vps, module_msg_vp);
591 ret=RLM_MODULE_REJECT;
593 DEBUG2("rlm_counter: Rejected user %s, check_item=%d, counter=%d",
594 key_vp->strvalue,check_vp->lvalue,counter);
600 static int counter_detach(void *instance)
602 rlm_counter_t *data = (rlm_counter_t *) instance;
604 paircompare_unregister(data->dict_attr, counter_cmp);
605 gdbm_close(data->gdbm);
606 free(data->filename);
608 free(data->key_name);
609 free(data->count_attribute);
610 free(data->counter_name);
617 * The module name should be the only globally exported symbol.
618 * That is, everything else should be 'static'.
620 * If the module needs to temporarily modify it's instantiation
621 * data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
622 * The server will then take care of ensuring that the module
623 * is single-threaded.
625 module_t rlm_counter = {
627 RLM_TYPE_THREAD_UNSAFE, /* type */
628 NULL, /* initialization */
629 counter_instantiate, /* instantiation */
631 NULL, /* authentication */
632 counter_authorize, /* authorization */
633 NULL, /* preaccounting */
634 counter_accounting, /* accounting */
635 NULL /* checksimul */
637 counter_detach, /* detach */