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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 * Copyright 2001 The FreeRADIUS server project
21 * Copyright 2001 Alan DeKok <aland@ox.org>
24 /* This module is based directly on the rlm_counter module */
27 #include <freeradius-devel/autoconf.h>
34 #include <freeradius-devel/radiusd.h>
35 #include <freeradius-devel/modules.h>
37 #define MAX_QUERY_LEN 1024
41 /* Note: When your counter spans more than 1 period (ie 3 months or 2 weeks), this module
42 * probably does NOT do what you want! It calculates the range of dates to count across
43 * by first calculating the End of the Current period and then subtracting the number of
44 * periods you specify from that to determine the beginning of the range.
46 * For example, if you specify a 3 month counter and today is June 15th, the end of the current
47 * period is June 30. Subtracting 3 months from that gives April 1st. So, the counter will
48 * sum radacct entries from April 1st to June 30. Then, next month, it will sum entries
49 * from May 1st to July 31st.
51 * To fix this behavior, we need to add some way of storing the Next Reset Time
55 static const char rcsid[] = "$Id$";
58 * Define a structure for our module configuration.
60 * These variables do not need to be in a structure, but it's
61 * a lot cleaner to do so, and a pointer to the structure can
62 * be used as the instance handle.
64 typedef struct rlm_sqlcounter_t {
65 char *counter_name; /* Daily-Session-Time */
66 char *check_name; /* Max-Daily-Session */
67 char *key_name; /* User-Name */
68 char *sqlmod_inst; /* instance of SQL module to use, usually just 'sql' */
69 char *query; /* SQL query to retrieve current session time */
70 char *reset; /* daily, weekly, monthly, never or user defined */
71 char *allowed_chars; /* safe characters list for SQL queries */
74 int key_attr; /* attribute number for key field */
75 int dict_attr; /* attribute number for the counter. */
79 * A mapping of configuration file names to internal variables.
81 * Note that the string is dynamically allocated, so it MUST
82 * be freed. When the configuration file parse re-reads the string,
83 * it free's the old one, and strdup's the new one, placing the pointer
84 * to the strdup'd string into 'config.string'. This gets around
87 static const CONF_PARSER module_config[] = {
88 { "counter-name", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,counter_name), NULL, NULL },
89 { "check-name", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,check_name), NULL, NULL },
90 { "key", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,key_name), NULL, NULL },
91 { "sqlmod-inst", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,sqlmod_inst), NULL, NULL },
92 { "query", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,query), NULL, NULL },
93 { "reset", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,reset), NULL, NULL },
94 { "safe-characters", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,allowed_chars), NULL, "@abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_: /"},
95 { NULL, -1, 0, NULL, NULL }
98 static char *allowed_chars = NULL;
101 * Translate the SQL queries.
103 static int sql_escape_func(char *out, int outlen, const char *in)
109 * Non-printable characters get replaced with their
110 * mime-encoded equivalents.
113 strchr(allowed_chars, *in) == NULL) {
115 * Only 3 or less bytes available.
121 snprintf(out, outlen, "=%02X", (unsigned char) in[0]);
130 * Only one byte left.
149 static int find_next_reset(rlm_sqlcounter_t *data, time_t timeval)
153 unsigned int num = 1;
156 char sCurrentTime[40], sNextTime[40];
158 tm = localtime_r(&timeval, &s_tm);
159 len = strftime(sCurrentTime, sizeof(sCurrentTime), "%Y-%m-%d %H:%M:%S", tm);
160 if (len == 0) *sCurrentTime = '\0';
161 tm->tm_sec = tm->tm_min = 0;
163 if (data->reset == NULL)
165 if (isdigit((int) data->reset[0])){
166 len = strlen(data->reset);
169 last = data->reset[len - 1];
170 if (!isalpha((int) last))
172 num = atoi(data->reset);
173 DEBUG("rlm_sqlcounter: num=%d, last=%c",num,last);
175 if (strcmp(data->reset, "hourly") == 0 || last == 'h') {
177 * Round up to the next nearest hour.
180 data->reset_time = mktime(tm);
181 } else if (strcmp(data->reset, "daily") == 0 || last == 'd') {
183 * Round up to the next nearest day.
187 data->reset_time = mktime(tm);
188 } else if (strcmp(data->reset, "weekly") == 0 || last == 'w') {
190 * Round up to the next nearest week.
193 tm->tm_mday += (7 - tm->tm_wday) +(7*(num-1));
194 data->reset_time = mktime(tm);
195 } else if (strcmp(data->reset, "monthly") == 0 || last == 'm') {
199 data->reset_time = mktime(tm);
200 } else if (strcmp(data->reset, "never") == 0) {
201 data->reset_time = 0;
203 radlog(L_ERR, "rlm_sqlcounter: Unknown reset timer \"%s\"",
208 len = strftime(sNextTime, sizeof(sNextTime),"%Y-%m-%d %H:%M:%S",tm);
209 if (len == 0) *sNextTime = '\0';
210 DEBUG2("rlm_sqlcounter: Current Time: %li [%s], Next reset %li [%s]",
211 timeval, sCurrentTime, data->reset_time, sNextTime);
217 /* I don't believe that this routine handles Daylight Saving Time adjustments
218 properly. Any suggestions?
221 static int find_prev_reset(rlm_sqlcounter_t *data, time_t timeval)
225 unsigned int num = 1;
228 char sCurrentTime[40], sPrevTime[40];
230 tm = localtime_r(&timeval, &s_tm);
231 len = strftime(sCurrentTime, sizeof(sCurrentTime), "%Y-%m-%d %H:%M:%S", tm);
232 if (len == 0) *sCurrentTime = '\0';
233 tm->tm_sec = tm->tm_min = 0;
235 if (data->reset == NULL)
237 if (isdigit((int) data->reset[0])){
238 len = strlen(data->reset);
241 last = data->reset[len - 1];
242 if (!isalpha((int) last))
244 num = atoi(data->reset);
245 DEBUG("rlm_sqlcounter: num=%d, last=%c",num,last);
247 if (strcmp(data->reset, "hourly") == 0 || last == 'h') {
249 * Round down to the prev nearest hour.
251 tm->tm_hour -= num - 1;
252 data->last_reset = mktime(tm);
253 } else if (strcmp(data->reset, "daily") == 0 || last == 'd') {
255 * Round down to the prev nearest day.
258 tm->tm_mday -= num - 1;
259 data->last_reset = mktime(tm);
260 } else if (strcmp(data->reset, "weekly") == 0 || last == 'w') {
262 * Round down to the prev nearest week.
265 tm->tm_mday -= (7 - tm->tm_wday) +(7*(num-1));
266 data->last_reset = mktime(tm);
267 } else if (strcmp(data->reset, "monthly") == 0 || last == 'm') {
270 tm->tm_mon -= num - 1;
271 data->last_reset = mktime(tm);
272 } else if (strcmp(data->reset, "never") == 0) {
273 data->reset_time = 0;
275 radlog(L_ERR, "rlm_sqlcounter: Unknown reset timer \"%s\"",
279 len = strftime(sPrevTime, sizeof(sPrevTime), "%Y-%m-%d %H:%M:%S", tm);
280 if (len == 0) *sPrevTime = '\0';
281 DEBUG2("rlm_sqlcounter: Current Time: %li [%s], Prev reset %li [%s]",
282 timeval, sCurrentTime, data->last_reset, sPrevTime);
289 * Replace %<whatever> in a string.
298 static int sqlcounter_expand(char *out, int outlen, const char *fmt, void *instance)
300 rlm_sqlcounter_t *data = (rlm_sqlcounter_t *) instance;
304 char tmpdt[40]; /* For temporary storing of dates */
308 for (p = fmt; *p ; p++) {
309 /* Calculate freespace in output */
310 freespace = outlen - (q - out);
314 if ((c != '%') && (c != '$') && (c != '\\')) {
316 * We check if we're inside an open brace. If we are
317 * then we assume this brace is NOT literal, but is
318 * a closing brace and apply it
320 if((c == '}') && openbraces) {
327 if (*++p == '\0') break;
328 if (c == '\\') switch(*p) {
343 } else if (c == '%') switch(*p) {
347 case 'b': /* last_reset */
348 snprintf(tmpdt, sizeof(tmpdt), "%lu", data->last_reset);
349 strNcpy(q, tmpdt, freespace);
352 case 'e': /* reset_time */
353 snprintf(tmpdt, sizeof(tmpdt), "%lu", data->reset_time);
354 strNcpy(q, tmpdt, freespace);
357 case 'k': /* Key Name */
358 strNcpy(q, data->key_name, freespace);
361 case 'S': /* SQL module instance */
362 strNcpy(q, data->sqlmod_inst, freespace);
373 DEBUG2("sqlcounter_expand: '%s'", out);
380 * See if the counter matches.
382 static int sqlcounter_cmp(void *instance, REQUEST *req,
383 UNUSED VALUE_PAIR *request, VALUE_PAIR *check,
384 VALUE_PAIR *check_pairs, VALUE_PAIR **reply_pairs)
386 rlm_sqlcounter_t *data = (rlm_sqlcounter_t *) instance;
388 char querystr[MAX_QUERY_LEN];
389 char responsestr[MAX_QUERY_LEN];
391 check_pairs = check_pairs; /* shut the compiler up */
392 reply_pairs = reply_pairs;
394 /* first, expand %k, %b and %e in query */
395 sqlcounter_expand(querystr, MAX_QUERY_LEN, data->query, instance);
397 /* second, xlat any request attribs in query */
398 radius_xlat(responsestr, MAX_QUERY_LEN, querystr, req, sql_escape_func);
400 /* third, wrap query with sql module call & expand */
401 snprintf(querystr, sizeof(querystr), "%%{%%S:%s}", responsestr);
402 sqlcounter_expand(responsestr, MAX_QUERY_LEN, querystr, instance);
404 /* Finally, xlat resulting SQL query */
405 radius_xlat(querystr, MAX_QUERY_LEN, responsestr, req, sql_escape_func);
407 counter = atoi(querystr);
409 return counter - check->lvalue;
414 * Do any per-module initialization that is separate to each
415 * configured instance of the module. e.g. set up connections
416 * to external databases, read configuration files, set up
417 * dictionary entries, etc.
419 * If configuration information is given in the config section
420 * that must be referenced in later calls, store a handle to it
421 * in *instance otherwise put a null pointer there.
423 static int sqlcounter_instantiate(CONF_SECTION *conf, void **instance)
425 rlm_sqlcounter_t *data;
429 char buffer[MAX_STRING_LEN];
432 * Set up a storage area for instance data
434 data = rad_malloc(sizeof(*data));
438 memset(data, 0, sizeof(*data));
441 * If the configuration parameters can't be parsed, then
444 if (cf_section_parse(conf, data, module_config) < 0) {
452 if (data->query == NULL) {
453 radlog(L_ERR, "rlm_sqlcounter: 'query' must be set.");
458 * Safe characters list for sql queries. Everything else is
459 * replaced with their mime-encoded equivalents.
461 allowed_chars = data->allowed_chars;
464 * Discover the attribute number of the key.
466 if (data->key_name == NULL) {
467 radlog(L_ERR, "rlm_sqlcounter: 'key' must be set.");
470 sql_escape_func(buffer, sizeof(buffer), data->key_name);
471 if (strcmp(buffer, data->key_name) != 0) {
472 radlog(L_ERR, "rlm_sqlcounter: The value for option 'key' is too long or contains unsafe characters.");
475 dattr = dict_attrbyname(data->key_name);
477 radlog(L_ERR, "rlm_sqlcounter: No such attribute %s",
481 data->key_attr = dattr->attr;
484 * Check the "sqlmod-inst" option.
486 if (data->sqlmod_inst == NULL) {
487 radlog(L_ERR, "rlm_sqlcounter: 'sqlmod-inst' must be set.");
490 sql_escape_func(buffer, sizeof(buffer), data->sqlmod_inst);
491 if (strcmp(buffer, data->sqlmod_inst) != 0) {
492 radlog(L_ERR, "rlm_sqlcounter: The value for option 'sqlmod-inst' is too long or contains unsafe characters.");
497 * Create a new attribute for the counter.
499 if (data->counter_name == NULL) {
500 radlog(L_ERR, "rlm_sqlcounter: 'counter-name' must be set.");
504 memset(&flags, 0, sizeof(flags));
505 dict_addattr(data->counter_name, 0, PW_TYPE_INTEGER, -1, flags);
506 dattr = dict_attrbyname(data->counter_name);
508 radlog(L_ERR, "rlm_sqlcounter: Failed to create counter attribute %s",
512 data->dict_attr = dattr->attr;
513 DEBUG2("rlm_sqlcounter: Counter attribute %s is number %d",
514 data->counter_name, data->dict_attr);
517 * Create a new attribute for the check item.
519 if (data->check_name == NULL) {
520 radlog(L_ERR, "rlm_sqlcounter: 'check-name' must be set.");
523 dict_addattr(data->check_name, 0, PW_TYPE_INTEGER, -1, flags);
524 dattr = dict_attrbyname(data->check_name);
526 radlog(L_ERR, "rlm_sqlcounter: Failed to create check attribute %s",
530 DEBUG2("rlm_sqlcounter: Check attribute %s is number %d",
531 data->check_name, dattr->attr);
534 * Discover the end of the current time period.
536 if (data->reset == NULL) {
537 radlog(L_ERR, "rlm_sqlcounter: 'reset' must be set.");
541 data->reset_time = 0;
543 if (find_next_reset(data,now) == -1)
547 * Discover the beginning of the current time period.
549 data->last_reset = 0;
551 if (find_prev_reset(data,now) == -1)
556 * Register the counter comparison operation.
558 paircompare_register(data->dict_attr, 0, sqlcounter_cmp, data);
566 * Find the named user in this modules database. Create the set
567 * of attribute-value pairs to check and reply with for this user
568 * from the database. The authentication code only needs to check
569 * the password, the rest is done here.
571 static int sqlcounter_authorize(void *instance, REQUEST *request)
573 rlm_sqlcounter_t *data = (rlm_sqlcounter_t *) instance;
574 int ret=RLM_MODULE_NOOP;
578 VALUE_PAIR *key_vp, *check_vp;
579 VALUE_PAIR *reply_item;
581 char querystr[MAX_QUERY_LEN];
582 char responsestr[MAX_QUERY_LEN];
584 /* quiet the compiler */
589 * Before doing anything else, see if we have to reset
592 if (data->reset_time && (data->reset_time <= request->timestamp)) {
595 * Re-set the next time and prev_time for this counters range
597 data->last_reset = data->reset_time;
598 find_next_reset(data,request->timestamp);
603 * Look for the key. User-Name is special. It means
604 * The REAL username, after stripping.
606 DEBUG2("rlm_sqlcounter: Entering module authorize code");
607 key_vp = (data->key_attr == PW_USER_NAME) ? request->username : pairfind(request->packet->vps, data->key_attr);
608 if (key_vp == NULL) {
609 DEBUG2("rlm_sqlcounter: Could not find Key value pair");
614 * Look for the check item
616 if ((dattr = dict_attrbyname(data->check_name)) == NULL) {
619 /* DEBUG2("rlm_sqlcounter: Found Check item attribute %d", dattr->attr); */
620 if ((check_vp= pairfind(request->config_items, dattr->attr)) == NULL) {
621 DEBUG2("rlm_sqlcounter: Could not find Check item value pair");
625 /* first, expand %k, %b and %e in query */
626 sqlcounter_expand(querystr, MAX_QUERY_LEN, data->query, instance);
628 /* second, xlat any request attribs in query */
629 radius_xlat(responsestr, MAX_QUERY_LEN, querystr, request, sql_escape_func);
631 /* third, wrap query with sql module & expand */
632 snprintf(querystr, sizeof(querystr), "%%{%%S:%s}", responsestr);
633 sqlcounter_expand(responsestr, MAX_QUERY_LEN, querystr, instance);
635 /* Finally, xlat resulting SQL query */
636 radius_xlat(querystr, MAX_QUERY_LEN, responsestr, request, sql_escape_func);
638 counter = atoi(querystr);
642 * Check if check item > counter
644 res=check_vp->lvalue - counter;
646 DEBUG2("rlm_sqlcounter: (Check item - counter) is greater than zero");
648 * We are assuming that simultaneous-use=1. But
649 * even if that does not happen then our user
650 * could login at max for 2*max-usage-time Is
655 * User is allowed, but set Session-Timeout.
656 * Stolen from main/auth.c
660 * If we are near a reset then add the next
661 * limit, so that the user will not need to
664 if (data->reset_time && (
665 res >= (data->reset_time - request->timestamp))) {
666 res = data->reset_time - request->timestamp;
667 res += check_vp->lvalue;
670 if ((reply_item = pairfind(request->reply->vps, PW_SESSION_TIMEOUT)) != NULL) {
671 if (reply_item->lvalue > res)
672 reply_item->lvalue = res;
674 if ((reply_item = paircreate(PW_SESSION_TIMEOUT, PW_TYPE_INTEGER)) == NULL) {
675 radlog(L_ERR|L_CONS, "no memory");
676 return RLM_MODULE_NOOP;
678 reply_item->lvalue = res;
679 pairadd(&request->reply->vps, reply_item);
684 DEBUG2("rlm_sqlcounter: Authorized user %s, check_item=%d, counter=%d",
685 key_vp->vp_strvalue,check_vp->lvalue,counter);
686 DEBUG2("rlm_sqlcounter: Sent Reply-Item for user %s, Type=Session-Timeout, value=%d",
687 key_vp->vp_strvalue,reply_item->lvalue);
690 char module_fmsg[MAX_STRING_LEN];
691 VALUE_PAIR *module_fmsg_vp;
693 DEBUG2("rlm_sqlcounter: (Check item - counter) is less than zero");
696 * User is denied access, send back a reply message
698 snprintf(msg, sizeof(msg), "Your maximum %s usage time has been reached", data->reset);
699 reply_item=pairmake("Reply-Message", msg, T_OP_EQ);
700 pairadd(&request->reply->vps, reply_item);
702 snprintf(module_fmsg, sizeof(module_fmsg), "rlm_sqlcounter: Maximum %s usage time reached", data->reset);
703 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
704 pairadd(&request->packet->vps, module_fmsg_vp);
706 ret=RLM_MODULE_REJECT;
708 DEBUG2("rlm_sqlcounter: Rejected user %s, check_item=%d, counter=%d",
709 key_vp->vp_strvalue,check_vp->lvalue,counter);
715 static int sqlcounter_detach(void *instance)
717 rlm_sqlcounter_t *data = (rlm_sqlcounter_t *) instance;
719 paircompare_unregister(data->dict_attr, sqlcounter_cmp);
722 free(data->check_name);
723 free(data->sqlmod_inst);
724 free(data->counter_name);
725 free(data->allowed_chars);
726 allowed_chars = NULL;
733 * The module name should be the only globally exported symbol.
734 * That is, everything else should be 'static'.
736 * If the module needs to temporarily modify it's instantiation
737 * data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
738 * The server will then take care of ensuring that the module
739 * is single-threaded.
741 module_t rlm_sqlcounter = {
744 RLM_TYPE_THREAD_SAFE, /* type */
745 sqlcounter_instantiate, /* instantiation */
746 sqlcounter_detach, /* detach */
748 NULL, /* authentication */
749 sqlcounter_authorize, /* authorization */
750 NULL, /* preaccounting */
751 NULL, /* accounting */
752 NULL, /* checksimul */
753 NULL, /* pre-proxy */
754 NULL, /* post-proxy */