Still need to set the value field
[freeradius.git] / src / modules / rlm_sql / sql.c
1 /*
2  *  sql.c               rlm_sql - FreeRADIUS SQL Module
3  *              Main code directly taken from ICRADIUS
4  *
5  * Version:     $Id$
6  *
7  *   This program is free software; you can redistribute it and/or modify
8  *   it under the terms of the GNU General Public License as published by
9  *   the Free Software Foundation; either version 2 of the License, or
10  *   (at your option) any later version.
11  *
12  *   This program is distributed in the hope that it will be useful,
13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *   GNU General Public License for more details.
16  *
17  *   You should have received a copy of the GNU General Public License
18  *   along with this program; if not, write to the Free Software
19  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20  *
21  * Copyright 2001,2006  The FreeRADIUS server project
22  * Copyright 2000  Mike Machado <mike@innercite.com>
23  * Copyright 2000  Alan DeKok <aland@ox.org>
24  * Copyright 2001  Chad Miller <cmiller@surfsouth.com>
25  */
26
27 RCSID("$Id$")
28
29 #include        <freeradius-devel/radiusd.h>
30 #include        <freeradius-devel/rad_assert.h>
31
32 #include        <sys/file.h>
33 #include        <sys/stat.h>
34
35 #include        <ctype.h>
36
37 #include        "rlm_sql.h"
38
39 #ifdef HAVE_PTHREAD_H
40 #endif
41
42 /*
43  *      Translate rlm_sql rcodes to humanly
44  *      readable reason strings.
45  */
46 const FR_NAME_NUMBER sql_rcode_table[] = {
47         { "success",            RLM_SQL_OK              },
48         { "need alt query",     RLM_SQL_ALT_QUERY       },
49         { "server error",       RLM_SQL_ERROR           },
50         { "query invalid",      RLM_SQL_QUERY_INVALID   },
51         { "no connection",      RLM_SQL_RECONNECT       },
52         { NULL, 0 }
53 };
54
55
56 void *mod_conn_create(TALLOC_CTX *ctx, void *instance)
57 {
58         int rcode;
59         rlm_sql_t *inst = instance;
60         rlm_sql_handle_t *handle;
61
62         /*
63          *      Connections cannot be alloced from the inst or
64          *      pool contexts due to threading issues.
65          */
66         handle = talloc_zero(ctx, rlm_sql_handle_t);
67         if (!handle) return NULL;
68
69         handle->log_ctx = talloc_pool(handle, 2048);
70         if (!handle->log_ctx) {
71                 talloc_free(handle);
72                 return NULL;
73         }
74
75         /*
76          *      Handle requires a pointer to the SQL inst so the
77          *      destructor has access to the module configuration.
78          */
79         handle->inst = inst;
80
81         rcode = (inst->module->sql_socket_init)(handle, inst->config);
82         if (rcode != 0) {
83         fail:
84                 /*
85                  *      Destroy any half opened connections.
86                  */
87                 talloc_free(handle);
88                 return NULL;
89         }
90
91         if (inst->config->connect_query) {
92                 if (rlm_sql_select_query(inst, NULL, &handle, inst->config->connect_query) != RLM_SQL_OK) goto fail;
93                 (inst->module->sql_finish_select_query)(handle, inst->config);
94         }
95
96         return handle;
97 }
98
99 /*************************************************************************
100  *
101  *      Function: sql_fr_pair_list_afrom_str
102  *
103  *      Purpose: Read entries from the database and fill VALUE_PAIR structures
104  *
105  *************************************************************************/
106 int sql_fr_pair_list_afrom_str(TALLOC_CTX *ctx, REQUEST *request, VALUE_PAIR **head, rlm_sql_row_t row)
107 {
108         VALUE_PAIR *vp;
109         char const *ptr, *value;
110         char buf[MAX_STRING_LEN];
111         char do_xlat = 0;
112         FR_TOKEN token, op = T_EOL;
113
114         /*
115          *      Verify the 'Attribute' field
116          */
117         if (!row[2] || row[2][0] == '\0') {
118                 REDEBUG("Attribute field is empty or NULL, skipping the entire row");
119                 return -1;
120         }
121
122         /*
123          *      Verify the 'op' field
124          */
125         if (row[4] != NULL && row[4][0] != '\0') {
126                 ptr = row[4];
127                 op = gettoken(&ptr, buf, sizeof(buf), false);
128                 if (!fr_assignment_op[op] && !fr_equality_op[op]) {
129                         REDEBUG("Invalid op \"%s\" for attribute %s", row[4], row[2]);
130                         return -1;
131                 }
132
133         } else {
134                 /*
135                  *  Complain about empty or invalid 'op' field
136                  */
137                 op = T_OP_CMP_EQ;
138                 REDEBUG("The op field for attribute '%s = %s' is NULL, or non-existent.", row[2], row[3]);
139                 REDEBUG("You MUST FIX THIS if you want the configuration to behave as you expect");
140         }
141
142         /*
143          *      The 'Value' field may be empty or NULL
144          */
145         if (!row[3]) {
146                 REDEBUG("Value field is empty or NULL, skipping the entire row");
147                 return -1;
148         }
149
150         value = row[3];
151
152         /*
153          *      If we have a new-style quoted string, where the
154          *      *entire* string is quoted, do xlat's.
155          */
156         if (row[3] != NULL &&
157            ((row[3][0] == '\'') || (row[3][0] == '`') || (row[3][0] == '"')) &&
158            (row[3][0] == row[3][strlen(row[3])-1])) {
159
160                 token = gettoken(&value, buf, sizeof(buf), false);
161                 switch (token) {
162                 /*
163                  *      Take the unquoted string.
164                  */
165                 case T_SINGLE_QUOTED_STRING:
166                 case T_DOUBLE_QUOTED_STRING:
167                         value = buf;
168                         break;
169
170                 /*
171                  *      Mark the pair to be allocated later.
172                  */
173                 case T_BACK_QUOTED_STRING:
174                         do_xlat = 1;
175
176                         /* FALL-THROUGH */
177
178                 /*
179                  *      Keep the original string.
180                  */
181                 default:
182                         value = row[3];
183                         break;
184                 }
185         }
186
187         /*
188          *      Create the pair
189          */
190         vp = fr_pair_make(ctx, NULL, row[2], NULL, op);
191         if (!vp) {
192                 REDEBUG("Failed to create the pair: %s", fr_strerror());
193                 return -1;
194         }
195
196         if (do_xlat) {
197                 if (fr_pair_mark_xlat(vp, value) < 0) {
198                         REDEBUG("Error marking pair for xlat: %s", fr_strerror());
199
200                         talloc_free(vp);
201                         return -1;
202                 }
203         } else {
204                 if (fr_pair_value_from_str(vp, value, -1) < 0) {
205                         REDEBUG("Error parsing value: %s", fr_strerror());
206
207                         talloc_free(vp);
208                         return -1;
209                 }
210         }
211
212         /*
213          *      Add the pair into the packet
214          */
215         fr_pair_add(head, vp);
216         return 0;
217 }
218
219 /** Call the driver's sql_fetch_row function
220  *
221  * Calls the driver's sql_fetch_row logging any errors. On success, will
222  * write row data to (*handle)->row.
223  *
224  * @param inst Instance of rlm_sql.
225  * @param request The Current request, may be NULL.
226  * @param handle Handle to retrieve errors for.
227  * @return on success RLM_SQL_OK, other sql_rcode_t constants on error.
228  */
229 sql_rcode_t rlm_sql_fetch_row(rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t **handle)
230 {
231         int ret;
232
233         if (!*handle || !(*handle)->conn) return RLM_SQL_ERROR;
234
235         /*
236          *      We can't implement reconnect logic here, because the caller
237          *      may require the original connection to free up queries or
238          *      result sets associated with that connection.
239          */
240         ret = (inst->module->sql_fetch_row)(*handle, inst->config);
241         if (ret < 0) {
242                 MOD_ROPTIONAL(RERROR, ERROR, "Error fetching row");
243
244                 rlm_sql_print_error(inst, request, *handle, false);
245         }
246
247         return ret;
248 }
249
250 /** Retrieve any errors from the SQL driver
251  *
252  * Retrieves errors from the driver from the last operation and writes them to
253  * to request/global log, in the ERROR, WARN, INFO and DEBUG categories.
254  *
255  * @param inst Instance of rlm_sql.
256  * @param request Current request, may be NULL.
257  * @param handle Handle to retrieve errors for.
258  * @param force_debug Force all errors to be logged as debug messages.
259  */
260 void rlm_sql_print_error(rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t *handle, bool force_debug)
261 {
262         char const      *driver;
263         sql_log_entry_t log[20];
264         size_t          num, i;
265
266         num = (inst->module->sql_error)(handle->log_ctx, log, (sizeof(log) / sizeof(*log)), handle, inst->config);
267         if (num == 0) {
268                 MOD_ROPTIONAL(RERROR, ERROR, "Unknown error");
269                 return;
270         }
271
272         driver = inst->config->sql_driver_name;
273
274         for (i = 0; i < num; i++) {
275                 if (force_debug) goto debug;
276
277                 switch (log[i].type) {
278                 case L_ERR:
279                         MOD_ROPTIONAL(RERROR, ERROR, "%s: %s", driver, log[i].msg);
280                         break;
281
282                 case L_WARN:
283                         MOD_ROPTIONAL(RWARN, WARN, "%s: %s", driver, log[i].msg);
284                         break;
285
286                 case L_INFO:
287                         MOD_ROPTIONAL(RINFO, INFO, "%s: %s", driver, log[i].msg);
288                         break;
289
290                 case L_DBG:
291                 default:
292                 debug:
293                         MOD_ROPTIONAL(RDEBUG, DEBUG, "%s: %s", driver, log[i].msg);
294                         break;
295                 }
296         }
297
298         talloc_free_children(handle->log_ctx);
299 }
300
301 /** Call the driver's sql_query method, reconnecting if necessary.
302  *
303  * @note Caller must call (inst->module->sql_finish_query)(handle, inst->config);
304  *      after they're done with the result.
305  *
306  * @param handle to query the database with. *handle should not be NULL, as this indicates
307  *      previous reconnection attempt has failed.
308  * @param request Current request.
309  * @param inst rlm_sql instance data.
310  * @param query to execute. Should not be zero length.
311  * @return RLM_SQL_OK on success, RLM_SQL_RECONNECT if a new handle is required
312  *      (also sets *handle = NULL), RLM_SQL_QUERY_INVALID/RLM_SQL_ERROR on invalid query or
313  *      connection error, RLM_SQL_ALT_QUERY on constraints violation.
314  */
315 sql_rcode_t rlm_sql_query(rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t **handle, char const *query)
316 {
317         int ret = RLM_SQL_ERROR;
318         int i, count;
319
320         /* Caller should check they have a valid handle */
321         rad_assert(*handle);
322
323         /* There's no query to run, return an error */
324         if (query[0] == '\0') {
325                 if (request) REDEBUG("Zero length query");
326                 return RLM_SQL_QUERY_INVALID;
327         }
328
329         /*
330          *  inst->pool may be NULL is this function is called by mod_conn_create.
331          */
332         count = inst->pool ? fr_connection_pool_get_num(inst->pool) : 0;
333
334         /*
335          *  Here we try with each of the existing connections, then try to create
336          *  a new connection, then give up.
337          */
338         for (i = 0; i < (count + 1); i++) {
339                 MOD_ROPTIONAL(RDEBUG2, DEBUG2, "Executing query: %s", query);
340
341                 ret = (inst->module->sql_query)(*handle, inst->config, query);
342                 switch (ret) {
343                 case RLM_SQL_OK:
344                         break;
345
346                 /*
347                  *      Run through all available sockets until we exhaust all existing
348                  *      sockets in the pool and fail to establish a *new* connection.
349                  */
350                 case RLM_SQL_RECONNECT:
351                         *handle = fr_connection_reconnect(inst->pool, *handle);
352                         /* Reconnection failed */
353                         if (!*handle) return RLM_SQL_RECONNECT;
354                         /* Reconnection succeeded, try again with the new handle */
355                         continue;
356
357                 /*
358                  *      These are bad and should make rlm_sql return invalid
359                  */
360                 case RLM_SQL_QUERY_INVALID:
361                         rlm_sql_print_error(inst, request, *handle, false);
362                         (inst->module->sql_finish_query)(*handle, inst->config);
363                         break;
364
365                 /*
366                  *      Server or client errors.
367                  *
368                  *      If the driver claims to be able to distinguish between
369                  *      duplicate row errors and other errors, and we hit a
370                  *      general error treat it as a failure.
371                  *
372                  *      Otherwise rewrite it to RLM_SQL_ALT_QUERY.
373                  */
374                 case RLM_SQL_ERROR:
375                         if (inst->module->flags & RLM_SQL_RCODE_FLAGS_ALT_QUERY) {
376                                 rlm_sql_print_error(inst, request, *handle, false);
377                                 (inst->module->sql_finish_query)(*handle, inst->config);
378                                 break;
379                         }
380                         ret = RLM_SQL_ALT_QUERY;
381                         /* FALL-THROUGH */
382
383                 /*
384                  *      Driver suggested using an alternative query
385                  */
386                 case RLM_SQL_ALT_QUERY:
387                         rlm_sql_print_error(inst, request, *handle, true);
388                         (inst->module->sql_finish_query)(*handle, inst->config);
389                         break;
390
391                 }
392
393                 return ret;
394         }
395
396         MOD_ROPTIONAL(RERROR, ERROR, "Hit reconnection limit");
397
398         return RLM_SQL_ERROR;
399 }
400
401 /** Call the driver's sql_select_query method, reconnecting if necessary.
402  *
403  * @note Caller must call (inst->module->sql_finish_select_query)(handle, inst->config);
404  *      after they're done with the result.
405  *
406  * @param inst rlm_sql instance data.
407  * @param request Current request.
408  * @param handle to query the database with. *handle should not be NULL, as this indicates
409  *        previous reconnection attempt has failed.
410  * @param query to execute. Should not be zero length.
411  * @return RLM_SQL_OK on success, RLM_SQL_RECONNECT if a new handle is required (also sets *handle = NULL),
412  *         RLM_SQL_QUERY_INVALID/RLM_SQL_ERROR on invalid query or connection error.
413  */
414 sql_rcode_t rlm_sql_select_query(rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t **handle,  char const *query)
415 {
416         int ret = RLM_SQL_ERROR;
417         int i, count;
418
419         /* Caller should check they have a valid handle */
420         rad_assert(*handle);
421
422         /* There's no query to run, return an error */
423         if (query[0] == '\0') {
424                 if (request) REDEBUG("Zero length query");
425
426                 return RLM_SQL_QUERY_INVALID;
427         }
428
429         /*
430          *  inst->pool may be NULL is this function is called by mod_conn_create.
431          */
432         count = inst->pool ? fr_connection_pool_get_num(inst->pool) : 0;
433
434         /*
435          *  For sanity, for when no connections are viable, and we can't make a new one
436          */
437         for (i = 0; i < (count + 1); i++) {
438                 MOD_ROPTIONAL(RDEBUG2, DEBUG2, "Executing select query: %s", query);
439
440                 ret = (inst->module->sql_select_query)(*handle, inst->config, query);
441                 switch (ret) {
442                 case RLM_SQL_OK:
443                         break;
444
445                 /*
446                  *      Run through all available sockets until we exhaust all existing
447                  *      sockets in the pool and fail to establish a *new* connection.
448                  */
449                 case RLM_SQL_RECONNECT:
450                         *handle = fr_connection_reconnect(inst->pool, *handle);
451                         /* Reconnection failed */
452                         if (!*handle) return RLM_SQL_RECONNECT;
453                         /* Reconnection succeeded, try again with the new handle */
454                         continue;
455
456                 case RLM_SQL_QUERY_INVALID:
457                 case RLM_SQL_ERROR:
458                 default:
459                         rlm_sql_print_error(inst, request, *handle, false);
460                         (inst->module->sql_finish_select_query)(*handle, inst->config);
461                         break;
462                 }
463
464                 return ret;
465         }
466
467         MOD_ROPTIONAL(RERROR, ERROR, "Hit reconnection limit");
468
469         return RLM_SQL_ERROR;
470 }
471
472
473 /*************************************************************************
474  *
475  *      Function: sql_getvpdata
476  *
477  *      Purpose: Get any group check or reply pairs
478  *
479  *************************************************************************/
480 int sql_getvpdata(TALLOC_CTX *ctx, rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t **handle,
481                   VALUE_PAIR **pair, char const *query)
482 {
483         rlm_sql_row_t   row;
484         int             rows = 0;
485         sql_rcode_t     rcode;
486
487         rad_assert(request);
488
489         rcode = rlm_sql_select_query(inst, request, handle, query);
490         if (rcode != RLM_SQL_OK) return -1; /* error handled by rlm_sql_select_query */
491
492         while (rlm_sql_fetch_row(inst, request, handle) == 0) {
493                 row = (*handle)->row;
494                 if (!row) break;
495                 if (sql_fr_pair_list_afrom_str(ctx, request, pair, row) != 0) {
496                         REDEBUG("Error parsing user data from database result");
497
498                         (inst->module->sql_finish_select_query)(*handle, inst->config);
499
500                         return -1;
501                 }
502                 rows++;
503         }
504         (inst->module->sql_finish_select_query)(*handle, inst->config);
505
506         return rows;
507 }
508
509 /*
510  *      Log the query to a file.
511  */
512 void rlm_sql_query_log(rlm_sql_t *inst, REQUEST *request,
513                        sql_acct_section_t *section, char const *query)
514 {
515         int fd;
516         char const *filename = NULL;
517         char *expanded = NULL;
518         size_t len;
519         bool failed = false;    /* Write the log message outside of the critical region */
520
521         filename = inst->config->logfile;
522         if (section && section->logfile) filename = section->logfile;
523
524         if (!filename || !*filename) {
525                 return;
526         }
527
528         if (radius_axlat(&expanded, request, filename, NULL, NULL) < 0) {
529                 return;
530         }
531
532         fd = exfile_open(inst->ef, filename, 0640, true);
533         if (fd < 0) {
534                 ERROR("rlm_sql (%s): Couldn't open logfile '%s': %s", inst->name,
535                       expanded, fr_syserror(errno));
536
537                 talloc_free(expanded);
538                 return;
539         }
540
541         len = strlen(query);
542         if ((write(fd, query, len) < 0) || (write(fd, ";\n", 2) < 0)) {
543                 failed = true;
544         }
545
546         if (failed) {
547                 ERROR("rlm_sql (%s): Failed writing to logfile '%s': %s", inst->name, expanded,
548                       fr_syserror(errno));
549         }
550
551         talloc_free(expanded);
552         exfile_close(inst->ef, fd);
553 }